78 results on '"Emre Yengel"'
Search Results
2. 17.1% Efficient Single‐Junction Organic Solar Cells Enabled by n‐Type Doping of the Bulk‐Heterojunction
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Yuanbao Lin, Yuliar Firdaus, Mohamad Insan Nugraha, Feng Liu, Safakath Karuthedath, Abdul‐Hamid Emwas, Weimin Zhang, Akmaral Seitkhan, Marios Neophytou, Hendrik Faber, Emre Yengel, Iain McCulloch, Leonidas Tsetseris, Frédéric Laquai, and Thomas D. Anthopoulos
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additives ,molecular doping ,nonfullerene acceptors ,organic photovoltaics ,Science - Abstract
Abstract Molecular doping is often used in organic semiconductors to tune their (opto)electronic properties. Despite its versatility, however, its application in organic photovoltaics (OPVs) remains limited and restricted to p‐type dopants. In an effort to control the charge transport within the bulk‐heterojunction (BHJ) of OPVs, the n‐type dopant benzyl viologen (BV) is incorporated in a BHJ composed of the donor polymer PM6 and the small‐molecule acceptor IT‐4F. The power conversion efficiency (PCE) of the cells is found to increase from 13.2% to 14.4% upon addition of 0.004 wt% BV. Analysis of the photoactive materials and devices reveals that BV acts simultaneously as n‐type dopant and microstructure modifier for the BHJ. Under optimal BV concentrations, these synergistic effects result in balanced hole and electron mobilities, higher absorption coefficients and increased charge‐carrier density within the BHJ, while significantly extending the cells' shelf‐lifetime. The n‐type doping strategy is applied to five additional BHJ systems, for which similarly remarkable performance improvements are obtained. OPVs of particular interest are based on the ternary PM6:Y6:PC71BM:BV(0.004 wt%) blend for which a maximum PCE of 17.1%, is obtained. The effectiveness of the n‐doping strategy highlights electron transport in NFA‐based OPVs as being a key issue.
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- 2020
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3. Large-area plastic nanogap electronics enabled by adhesion lithography
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James Semple, Dimitra G. Georgiadou, Gwenhivir Wyatt-Moon, Minho Yoon, Akmaral Seitkhan, Emre Yengel, Stephan Rossbauer, Francesca Bottacchi, Martyn A. McLachlan, Donal D. C. Bradley, and Thomas D. Anthopoulos
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Electronics ,TK7800-8360 ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Adhesion lithography enables coplanar nanogap electrode fabrication and allows for the realisation of nanoscale electronics manufacturing A collaborative team led by Thomas Anthopoulos from King Abdullah University of Science and Technology demonstrated a novel method for patterning coplanar electrodes with inter-electrode distances of less than 15 nm and arbitrarily large aspect ratios. This facile manufacturing method, called adhesion lithography, was used to fabricate a series of functional nanoscale electronic devices on various substrates. These flexible electronic devices, which are technologically relevant, included self-aligned-gate transistors, radio frequency diodes and rectifying circuits, multi-colour organic light-emitting diodes and multilevel non-volatile memory devices. Given its versatility in the fabrication of functional electronic devices and its solution-processing compatibility with a range of semiconductors and substrate materials, adhesion lithography is an attractive processing method for the high-throughput manufacture of large-scale flexible electronics at the nanoscale.
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- 2018
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4. Fully Sprayed Metal Oxide Transistors Utilizing Ti3C2Tx MXene Contacts
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Emre Yarali, Jehad K. El-Demellawi, Hendrik Faber, Dipti Naphade, Yuanbao Lin, Kalaivanan Loganathan, Wejdan S. Alghamdi, Xiangming Xu, Atteq ur Rehman, Erkan Aydin, Despoina Gkeka, Linqu Luo, Emre Yengel, Temur Maksudov, Stefaan De Wolf, Husam N. Alshareef, and Thomas D. Anthopoulos
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Materials Chemistry ,Electrochemistry ,Electronic, Optical and Magnetic Materials - Published
- 2023
5. Bearing fault detection method based on statistical analysis and KL distance.
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Arda Mollakoy, Emre Yengel, and B. Ugur Töreyin
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- 2016
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6. Cl2-Doped CuSCN Hole Transport Layer for Organic and Perovskite Solar Cells with Improved Stability
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Jian-Wei Liang, Yuliar Firdaus, Randi Azmi, Hendrik Faber, Dimitrios Kaltsas, Chun Hong Kang, Mohamad Insan Nugraha, Emre Yengel, Tien Khee Ng, Stefaan De Wolf, Leonidas Tsetseris, Boon S. Ooi, and Thomas D. Anthopoulos
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Fuel Technology ,Renewable Energy, Sustainability and the Environment ,Chemistry (miscellaneous) ,Materials Chemistry ,Energy Engineering and Power Technology - Published
- 2022
7. Photophysics of Defect-Passivated Quasi-2D (PEA)2PbBr4 Perovskite Using an Organic Small Molecule
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Jafar I. Khan, Murali Gedda, Mingcong Wang, Emre Yengel, Joshua A. Kreß, Yana Vaynzof, Thomas D. Anthopoulos, and Frédéric Laquai
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Fuel Technology ,Renewable Energy, Sustainability and the Environment ,Chemistry (miscellaneous) ,Materials Chemistry ,Energy Engineering and Power Technology - Published
- 2022
8. On the optimum ring ratio determination for 16-DAPSK modulation in OFDM systems.
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Fatih Genc, Emre Yengel, Asuman Savascihabes, and özgür Ertug
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- 2014
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9. 28.2%-efficient, outdoor-stable perovskite/silicon tandem solar cell
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Frédéric Laquai, Michele De Bastiani, Emre Yengel, Stefaan De Wolf, Omar F. Mohammed, Erkan Aydin, Michael Salvador, Thomas D. Anthopoulos, Maxime Babics, Osman M. Bakr, Wenbo Yan, Thomas Allen, Furkan Halis Isikgor, Kaichen Zhu, Atteq ur Rehman, Fuzong Xu, Xiaopeng Zheng, Jun Yin, Mingcong Wang, Yajun Gao, Jafar Iqbal Khan, George T. Harrison, Esma Ugur, Jiang Liu, Anand S. Subbiah, and Mario Lanza
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Materials science ,Silicon ,Tandem ,Passivation ,business.industry ,Stacking ,chemistry.chemical_element ,law.invention ,General Energy ,chemistry ,law ,Phase (matter) ,Solar cell ,Optoelectronics ,Crystalline silicon ,business ,Perovskite (structure) - Abstract
Summary Stacking perovskite solar cells onto crystalline silicon bottom cells in a monolithic tandem configuration enables power-conversion efficiencies (PCEs) well above those of their single-junction counterparts. However, state-of-the-art wide-band-gap perovskite films suffer from phase stability issues. Here, we show how carbazole as an additive to the perovskite precursor solution can not only reduce nonradiative recombination losses but, perhaps more importantly, also can suppress phase segregation under exposure to moisture and light illumination. This enables a stabilized PCE of 28.6% (independently certified at 28.2%) for a monolithic perovskite/silicon tandem solar cell over ∼1 cm2 and 27.1% over 3.8 cm2, built from a textured silicon heterojunction solar cell. The modified tandem devices retain ∼93% of their performance over 43 days in a hot and humid outdoor environment of almost 100% relative humidity over 250 h under continuous 1-sun illumination and about 87% during a 85/85 damp-heat test for 500 h, demonstrating the improved phase stability.
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- 2021
10. Charge Carrier Recombination at Perovskite/Hole Transport Layer Interfaces Monitored by Time-Resolved Spectroscopy
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Frédéric Laquai, Thomas D. Anthopoulos, Jafar Iqbal Khan, Esma Ugur, Furkan Halis Isikgor, Waseem Raja, Stefaan De Wolf, George T. Harrison, and Emre Yengel
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Fuel Technology ,Materials science ,Renewable Energy, Sustainability and the Environment ,Chemistry (miscellaneous) ,Chemical physics ,Materials Chemistry ,Energy Engineering and Power Technology ,Hole transport layer ,Charge carrier ,Time-resolved spectroscopy ,Recombination ,Perovskite (structure) - Published
- 2021
11. Concurrent cationic and anionic perovskite defect passivation enables 27.4% perovskite/silicon tandems with suppression of halide segregation
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Frédéric Laquai, Iain McCulloch, Thomas D. Anthopoulos, Emre Yengel, Mingcong Wang, Shynggys Zhumagali, Furkan Halis Isikgor, Esma Ugur, Mathan Kumar Eswaran, Atteq ur Rehman, George T. Harrison, Stefaan De Wolf, Nicola Gasparini, Thomas Allen, Michele De Bastiani, Emmanuel Van Kerschaver, Calvyn Travis Howells, Udo Schwingenschlögl, Erkan Aydin, Francesco Furlan, Derya Baran, Jiang Liu, and Anand S. Subbiah
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Materials science ,Passivation ,Silicon ,Tandem ,business.industry ,Wide-bandgap semiconductor ,chemistry.chemical_element ,Halide ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,General Energy ,chemistry ,Chemical engineering ,Photovoltaics ,Grain boundary ,0210 nano-technology ,business ,Perovskite (structure) - Abstract
Summary Stable and efficient perovskite/silicon tandem solar cells require defect passivation and suppression of light-induced phase segregation of the wide-band-gap perovskite. Here, we report how molecules containing both electron-rich and electron-poor moieties, such as phenformin hydrochloride (PhenHCl), can satisfy both requirements, independent of the perovskite’s surface chemical composition and its grain boundaries and interfaces. PhenHCl-passivated wide-band-gap (∼1.68 eV) perovskite p-i-n single-junction solar cells deliver an open-circuit voltage (VOC) ∼100 mV higher than control devices, resulting in power conversion efficiencies (PCEs) up to 20.5%. These devices do not show any VOC losses after more than 3,000 h of thermal stress at 85°C in a nitrogen ambient. Moreover, PhenHCl passivation improves the PCE of textured perovskite/silicon tandem solar cells from 25.4% to 27.4%. Our findings provide critical insights for improved passivation of metal halide perovskite surfaces and the fabrication of highly efficient and stable perovskite-based single-junction and tandem solar cells.
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- 2021
12. 18.4 % Organic Solar Cells Using a High Ionization Energy Self‐Assembled Monolayer as Hole‐Extraction Interlayer
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Osman M. Bakr, Xiaopeng Zheng, Dimitris Kaltsas, Leonidas Tsetseris, Hendrik Faber, Yuliar Firdaus, Artiom Magomedov, Yuanbao Lin, Neha Chaturvedi, Thomas D. Anthopoulos, Abdulrahman El-Labban, Kalaivanan Loganathan, Frédéric Laquai, Dipti R Naphade, Emre Yarali, Sanaa Hayel Nazil Alshammari, Despoina Gkeka, Emre Yengel, and Vytautas Getautis
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Materials science ,Organic solar cell ,General Chemical Engineering ,Energy conversion efficiency ,Self-assembled monolayer ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Styrene ,chemistry.chemical_compound ,General Energy ,Sulfonate ,PEDOT:PSS ,chemistry ,Monolayer ,Environmental Chemistry ,Physical chemistry ,General Materials Science ,0210 nano-technology ,HOMO/LUMO - Abstract
Self-assembled monolayers (SAMs) based on Br-2PACz ([2-(3,6-dibromo-9H-carbazol-9-yl)ethyl]phosphonic acid) 2PACz ([2-(9H-Carbazol-9-yl)ethyl]phosphonic acid) and MeO-2PACz ([2-(3,6-dimethoxy-9H-carbazol-9-yl)ethyl]phosphonic acid) molecules were investigated as hole-extracting interlayers in organic photovoltaics (OPVs). The highest occupied molecular orbital (HOMO) energies of these SAMs were measured at -6.01 and -5.30 eV for Br-2PACz and MeO-2PACz, respectively, and found to induce significant changes in the work function (WF) of indium-tin-oxide (ITO) electrodes upon chemical functionalization. OPV cells based on PM6 (poly[(2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)]) : BTP-eC9 : PC71 BM ([6,6]-phenyl-C71-butyric acid methyl ester) using ITO/Br-2PACz anodes exhibited a maximum power conversion efficiency (PCE) of 18.4 %, outperforming devices with ITO/MeO-2PACz (14.5 %) and ITO/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT : PSS) (17.5 %). The higher PCE was found to originate from the much higher WF of ITO/Br-2PACz (-5.81 eV) compared to ITO/MeO-2PACz (4.58 eV) and ITO/PEDOT : PSS (4.9 eV), resulting in lower interface resistance, improved hole transport/extraction, lower trap-assisted recombination, and longer carrier lifetimes. Importantly, the ITO/Br-2PACz electrode was chemically stable, and after removal of the SAM it could be recycled and reused to construct fresh OPVs with equally impressive performance.
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- 2021
13. The Energetic Frontiers of Non-Fullerene Organic Solar Cells
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Jules Bertrandie, Jianhua Han, Catherine S. P. De Castro, Emre Yengel, Julien Gorenflot, Thomas Anthopoulos, Frederic Laquai, Anirudh Sharma, and Derya Baran
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- 2022
14. The Energy Level Conundrum of Organic Semiconductors in Solar Cells
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Jules Bertrandie, Jianhua Han, Catherine S. P. De Castro, Emre Yengel, Julien Gorenflot, Thomas Anthopoulos, Frederic Laquai, Anirudh Sharma, and Derya Baran
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Mechanics of Materials ,Mechanical Engineering ,General Materials Science - Abstract
The frontier molecular energy levels of organic semiconductors are decisive for their fundamental function and efficiency in optoelectronics. However, the precise determination of these energy levels and their variation when using different techniques makes it hard to compare and establish design rules. In this work, the energy levels of 33 organic semiconductors via cyclic voltammetry (CV), density functional theory, ultraviolet photoelectron spectroscopy, and low-energy inverse photoelectron spectroscopy are determined. Solar cells are fabricated to obtain key device parameters and relate them to the significant differences in the energy levels and offsets obtained from different methods. In contrast to CV, the photovoltaic gap measured using photoelectron spectroscopy (PES) correlates well with the experimental device V
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- 2022
15. A Simple n-Dopant Derived from Diquat Boosts the Efficiency of Organic Solar Cells to 18.3%
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Abdul-Hamid M. Emwas, Osman M. Bakr, Thomas D. Anthopoulos, Leonidas Tsetseris, Emre Yengel, Mohamad Insan Nugraha, Jiakai Liu, Yuliar Firdaus, Xiaopeng Zheng, Martin Heeney, Filip Aniés, Hendrik Faber, Wandi Wahyudi, Emre Yarali, Yuanbao Lin, and Alberto D. Scaccabarozzi
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Materials science ,Organic solar cell ,Dopant ,Renewable Energy, Sustainability and the Environment ,Doping ,Energy Engineering and Power Technology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Diquat ,0104 chemical sciences ,chemistry.chemical_compound ,Fuel Technology ,Chemical engineering ,chemistry ,Chemistry (miscellaneous) ,Materials Chemistry ,0210 nano-technology - Abstract
Molecular doping has recently been shown to improve the operating characteristics of organic photovoltaics (OPVs). Here, we prepare neutral Diquat (DQ) and use it as n-dopant to improve the perform...
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- 2020
16. Ledge-directed epitaxy of continuously self-aligned single-crystalline nanoribbons of transition metal dichalcogenides
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Thomas D. Anthopoulos, Wen-Hao Chang, Jui-Han Fu, Wei Ting Hsu, Vincent Tung, Dipti R Naphade, Rehab Albaridy, Lain-Jong Li, Mariam Hakami, Chen Tse-An, Jeehwan Kim, Zhen Cao, Emre Yengel, Steven Brems, Chien-Ju Lee, Chih-Piao Chuu, Chih-Chan Hsu, Areej Aljarb, Sang-Hoon Bae, Ming-Yang Li, Sergei Lopatin, and Yi Wan
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Electron mobility ,Materials science ,Oxide ,02 engineering and technology ,Substrate (electronics) ,010402 general chemistry ,Epitaxy ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,law ,Monolayer ,General Materials Science ,business.industry ,Mechanical Engineering ,Transistor ,Heterojunction ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Exfoliation joint ,0104 chemical sciences ,chemistry ,Mechanics of Materials ,Optoelectronics ,0210 nano-technology ,business - Abstract
Two-dimensional transition metal dichalcogenide nanoribbons are touted as the future extreme device downscaling for advanced logic and memory devices but remain a formidable synthetic challenge. Here, we demonstrate a ledge-directed epitaxy (LDE) of dense arrays of continuous, self-aligned, monolayer and single-crystalline MoS2 nanoribbons on β-gallium (iii) oxide (β-Ga2O3) (100) substrates. LDE MoS2 nanoribbons have spatial uniformity over a long range and transport characteristics on par with those seen in exfoliated benchmarks. Prototype MoS2-nanoribbon-based field-effect transistors exhibit high on/off ratios of 108 and an averaged room temperature electron mobility of 65 cm2 V−1 s−1. The MoS2 nanoribbons can be readily transferred to arbitrary substrates while the underlying β-Ga2O3 can be reused after mechanical exfoliation. We further demonstrate LDE as a versatile epitaxy platform for the growth of p-type WSe2 nanoribbons and lateral heterostructures made of p-WSe2 and n-MoS2 nanoribbons for futuristic electronics applications. Aligned arrays of single-crystalline monolayer TMD nanoribbons with high aspect ratios, as well as their lateral heterostructures, are realized, with the growth directed by the ledges on the β-Ga2O3 substrate. This approach provides an epitaxy platform for advanced electronics applications of TMD nanoribbons.
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- 2020
17. Rapid Photonic Processing of High-Electron-Mobility PbS Colloidal Quantum Dot Transistors
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Emre Yengel, Yuanbao Lin, Mohamad Insan Nugraha, Yuliar Firdaus, Elefterios Lidorikis, Hendrik Faber, Abdulrahman El-Labban, Emre Yarali, Thomas D. Anthopoulos, and Murali Gedda
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Fabrication ,Materials science ,02 engineering and technology ,thin-film transistors ,010402 general chemistry ,colloidal quantum dots ,01 natural sciences ,law.invention ,Colloid ,law ,General Materials Science ,Electronics ,business.industry ,Transistor ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Thin-film transistor ,Quantum dot ,large-area electronics ,flash lamp annealing ,Optoelectronics ,Colloidal quantum dots ,solution-processed semiconductors ,Photonics ,0210 nano-technology ,business ,Research Article - Abstract
Recent advances in solution-processable semiconducting colloidal quantum dots (CQDs) have enabled their use in a range of (opto)electronic devices. In most of these studies, device fabrication relied almost exclusively on thermal annealing to remove organic residues and enhance inter-CQD electronic coupling. Despite its widespread use, however, thermal annealing is a lengthy process, while its effectiveness to eliminate organic residues remains limited. Here, we exploit the use of xenon flash lamp sintering to post-treat solution-deposited layers of lead sulfide (PbS) CQDs and their application in n-channel thin-film transistors (TFTs). The process is simple, fast, and highly scalable and allows for efficient removal of organic residues while preserving both quantum confinement and high channel current modulation. Bottom-gate, top-contact PbS CQD TFTs incorporating SiO2 as the gate dielectric exhibit a maximum electron mobility of 0.2 cm2 V–1 s–1, a value higher than that of control transistors (≈10–2 cm2 V–1 s–1) processed via thermal annealing for 30 min at 120 °C. Replacing SiO2 with a polymeric dielectric improves the transistor’s channel interface, leading to a significant increase in electron mobility to 3.7 cm2 V–1 s–1. The present work highlights the potential of flash lamp annealing as a promising method for the rapid manufacture of PbS CQD-based (opto)electronic devices and circuits.
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- 2020
18. A universal solution processed interfacial bilayer enabling ohmic contact in organic and hybrid optoelectronic devices
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Emre Yengel, Benjamin Hartmeier, Henry J. Snaith, Joel Troughton, Hendrik Faber, Thomas D. Anthopoulos, Leonidas Tsetseris, Akmaral Seitkhan, Norman Albert Lüchinger, Xin Song, Iain McCulloch, Yen-Hung Lin, Marek Oszajca, Nicola Gasparini, Stefaan De Wolf, Derya Baran, Michael Rossier, Jan Kosco, Furkan Halis Isikgor, Tong Liu, and Marios Neophytou
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Electron mobility ,Materials science ,Organic solar cell ,Renewable Energy, Sustainability and the Environment ,business.industry ,Bilayer ,Schottky barrier ,Pollution ,Electrical contacts ,Threshold voltage ,Semiconductor ,Nuclear Energy and Engineering ,Environmental Chemistry ,Optoelectronics ,business ,Ohmic contact - Abstract
Optoelectronic devices typically require low-resistance ohmic contacts between the optical active layers and metal electrodes. Failure to make such a contact often results in a Schottky barrier which inhibits charge extraction and, in turn, reduces device performance. Here, we introduce a universal solution processable metal-oxide/organic interfacial bilayer which forms a near-perfect ohmic contact between both organic and inorganic semiconductors and metals. This bilayer comprises a Nb-doped TiO2 metal oxide with enhanced electron mobility and reduced trap density compared to pristine TiO2, in combination with a metal-chelating organic molecule to make an intimate electrical contact with silver metallic electrodes. Using this universal interfacial bilayer, we demonstrate substantial efficiency improvements in organic solar cells (from 9.3% to 12.6% PCE), light emitting diodes (from 0.6 to 2.2 cd W−1) and transistors (from 19.7 to 13.9 V threshold voltage). In particular, a boost in efficiency for perovskite solar cells (from 18.7% up to 20.7% PCE) with up to 83% fill factor is achieved with no-operational lifetime loss for at least 1000 hours under continuous, full-spectrum illumination.
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- 2020
19. Liquid phase exfoliation of MoS2 and WS2 in aqueous ammonia and their application in highly efficient organic solar cells
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Begimai Adilbekova, Abdulrahman El-Labban, Yuanbao Lin, Yuliar Firdaus, Emre Yengel, Hendrik Faber, Thomas D. Anthopoulos, Vincent Tung, Dalaver H. Anjum, and George T. Harrison
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Aqueous solution ,Materials science ,Organic solar cell ,Tungsten disulfide ,Energy conversion efficiency ,General Chemistry ,Environmentally friendly ,Exfoliation joint ,chemistry.chemical_compound ,chemistry ,Transition metal ,Chemical engineering ,Materials Chemistry ,Molybdenum disulfide - Abstract
Simple, scalable and cost-effective synthesis of quality two-dimensional (2D) transition metal dichalcogenides (TMDs) is critical for fundamental investigations but also for the widespread adoption of these low-dimensional materials in an expanding range of device applications. Here, we report on the liquid-phase exfoliation (LPE) of molybdenum disulfide (MoS2) and tungsten disulfide (WS2) in aqueous ammonia (NH3(aq.)) as a greener alternative to commonly used but less environmentally friendly solvents. The synthesized nanosheets can be prepared in high concentrations (0.5–1 mg mL−1) and exhibit excellent stoichiometric and structural quality with a semiconducting character. These characteristics make them ideal for application in organic optoelectronics, where optical transparency and suitable energetics are two important prerequisites. When MoS2 and WS2 are used as the hole transport layer materials in organic photovoltaics, cells with a power conversion efficiency of 14.9 and 15.6%, respectively, are obtained, highlighting the potential of the aqueous ammonia-based LPE method for the preparation of high quality TMDs. The method could potentially be extended to other TMDs.
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- 2020
20. Printed memtransistor utilizing a hybrid perovskite/organic heterojunction channel
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Emre Yengel, Hendrik Faber, Yuanbao Lin, Frédéric Laquai, Ming-Chun Tang, Thomas D. Anthopoulos, Ruipeng Li, Kalaivanan Loganathan, Iain McCulloch, Chun Ma, Weimin Zhang, Hu Chen, and Jafar Iqbal Khan
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Materials science ,business.industry ,Transistor ,Heterosynaptic plasticity ,Heterojunction ,Memristor ,Integrated circuit ,law.invention ,Neuromorphic engineering ,law ,Modulation ,Optoelectronics ,General Materials Science ,business ,Perovskite (structure) - Abstract
Neuromorphic computing has the potential to address the inherent limitations of conventional integrated circuit technology, ranging from perception, pattern recognition, to memory and decision-making (Acc. Chem. Res.2019,52(4), 964−974) (Nature2004,431(7010), 796−803) (Nat. Nanotechnol.2013,8(1), 13−24). Despite their low power consumption (Nano Lett.2016,16(11), 6724−6732), traditional two-terminal memristors can perform only a single function while lacking heterosynaptic plasticity (Nanotechnology2013,24(38), 382001). Inspired by the unconditioned reflex, multiterminal memristive transistors (memtransistor) were developed to realize complex functions, such as multiterminal modulation and heterosynaptic plasticity (Nature2018,554, (7693), 500−504). Here we combine a hybrid metal halide perovskite with an organic conjugated polymer to form heterojunction transistors that are responsive to both electrical and optical stimuli. We show that the synergistic effects of photoinduced ion migration in the perovskite and electronic transport in the polymer layers can be exploited to realize memristive functions. The device combines reversible, nonvolatile conductance modulation with large switching current ratios, high endurance, and long retention times. Using in situ scanning Kelvin probe microscopy and variable-temperature charge transport measurement, we correlate the collective effects of bias-induced and photoinduced ion migration with the heterosynaptic behavior observed in this hybrid memtransistor. The hybrid heterojunction channel concept is expected to be applicable to other material combinations making it a promising platform for deployment in innovative neuromorphic devices of the future.
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- 2022
21. 14 GHz Schottky Diodes Using a p-Doped Organic Polymer
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Kalaivanan Loganathan, Alberto D. Scaccabarozzi, Hendrik Faber, Federico Ferrari, Zhanibek Bizak, Emre Yengel, Dipti R. Naphade, Murali Gedda, Qiao He, Olga Solomeshch, Begimai Adilbekova, Emre Yarali, Leonidas Tsetseris, Khaled N. Salama, Martin Heeney, Nir Tessler, and Thomas D. Anthopoulos
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Technology ,EFFICIENCY ,Chemistry, Multidisciplinary ,Materials Science ,Schottky diodes ,Materials Science, Multidisciplinary ,09 Engineering ,Physics, Applied ,General Materials Science ,Nanoscience & Nanotechnology ,Organic semiconductor ,Science & Technology ,02 Physical Sciences ,Chemistry, Physical ,radio frequency electronics ,Mechanical Engineering ,Physics ,TRANSPORT ,Chemistry ,Physics, Condensed Matter ,Mechanics of Materials ,Physical Sciences ,TRANSISTORS ,Science & Technology - Other Topics ,printed electronics ,rectifier circuits ,03 Chemical Sciences - Abstract
The low carrier mobility of organic semiconductors and the high parasitic resistance and capacitance often encountered in conventional organic Schottky diodes, hinder their deployment in emerging radio frequency (RF) electronics. Here we overcome these limitations by combining self-aligned asymmetric nanogap electrodes (∼25 nm) produced by adhesion-lithography, with a high mobility organic semiconductor and demonstrate RF Schottky diodes able to operate in the 5G frequency spectrum. We used C16 IDT-BT, as the high hole mobility polymer, and studied the impact of p-doping on the diode performance. Pristine C16 IDT-BT-based diodes exhibit maximum intrinsic and extrinsic cutoff frequencies (fC ) of >100 and 6 GHz, respectively. This extraordinary performance is attributed primarily to the planar nature of the nanogap channel and the diode's small junction capacitance (< 2 pF). Doping of C16 IDT-BT with the molecular p-dopant C60 F48 , improves the diode's performance further by reducing the series resistance resulting to intrinsic and extrinsic fC of >100 and ∼14 GHz respectively, while the DC output voltage of a RF rectifier circuit increases by a tenfold. Our work highlights the importance of the planar nanogap architecture and paves the way for the use of organic Schottky diodes in large-area radio frequency electronics of the future. This article is protected by copyright. All rights reserved.
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- 2021
22. High‐Efficiency Perovskite–Organic Blend Light‐Emitting Diodes Featuring Self‐Assembled Monolayers as Hole‐Injecting Interlayers
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Murali Gedda, Despoina Gkeka, Mohamad Insan Nugraha, Alberto D. Scaccabarozzi, Emre Yengel, Jafar I. Khan, Iain Hamilton, Yuanbao Lin, Marielle Deconinck, Yana Vaynzof, Frédéric Laquai, Donal D. C. Bradley, and Thomas D. Anthopoulos
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Renewable Energy, Sustainability and the Environment ,General Materials Science - Published
- 2022
23. One-step growth of reduced graphene oxide on arbitrary substrates
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Mingguang Chen, Thomas D. Anthopoulos, Emre Yengel, Junwei Zhang, Jing-Kai Huang, Chenxu Zhu, Chenhui Zhang, Mohamed N. Hedhili, Xixiang Zhang, and Xin He
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Materials science ,Graphene ,business.industry ,Oxide ,Photodetector ,One-Step ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Catalysis ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,General Materials Science ,Field-effect transistor ,Electronics ,Photonics ,0210 nano-technology ,business - Abstract
Reduced graphene oxide (rGO) has inherited the outstanding electronic, optical, thermal and mechanical properties of graphene to a large extent, while maintaining sufficient chemically active sites. Therefore, it has attracted a great deal of research attention in the fields of energy storage, electronics, photonics, catalysis, environmental engineering, etc. Currently, the most popular way to prepare rGO is to reduce graphene oxide, which is obtained by modified Hummer methods using tedious treatments in a harsh environment, to rGO flakes. Industrial applications demand advanced preparation methods that can mass produce highly uniform rGO sheets on arbitrary substrates. In this work, a one-step growth process is introduced that utilizes cellulose acetate as a precursor, without any catalysts, to produce uniform ultrathin rGO films on various substrates and free-standing rGO powders. Systematic spectroscopic and microscopic studies on the resulting rGO are performed. Prototypes of electronic and optoelectronic devices, such as field effect transistors (FETs), photodetectors, and humidity sensors, are fabricated and tested, demonstrating the intriguing applications of our rGO materials across a wide range of fields.
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- 2019
24. Ruddlesden-Popper-Phase Hybrid Halide Perovskite/Small-Molecule Organic Blend Memory Transistors
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Yana Vaynzof, Murali Gedda, Ming-Chun Tang, Joshua A Kreß, Thomas D. Anthopoulos, Prashant Kumar, Hendrik Faber, Emre Yengel, Siyuan Zhang, Feliciano Giustino, George Volonakis, Christina A. Hacker, Fabian Paulus, Dipti R Naphade, King Abdullah University of Science and Technology (KAUST), Technische Universität Dresden = Dresden University of Technology (TU Dresden), National Institute of Standards and Technology [Gaithersburg] (NIST), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), University of Texas at Austin [Austin], King Abdullah University of Science and Technology, ENERGYMAPS n°714067, European Research Council, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
non-volatile memory ,Materials science ,floating-gate transistor ,Photodetector ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,law.invention ,Ruddlesden-Popper phase ,law ,Phase (matter) ,[CHIM]Chemical Sciences ,General Materials Science ,2D perovskite ,floating-gate transistors ,additive engineering ,Diode ,Perovskite (structure) ,business.industry ,two-dimensional perovskites ,Mechanical Engineering ,Transistor ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Organic semiconductor ,Non-volatile memory ,Mechanics of Materials ,perovskite-organic blends ,engineering ,Optoelectronics ,0210 nano-technology ,business - Abstract
International audience; Controlling the morphology of metal halide perovskite layers during processing is critical for the manufacturing of optoelectronics. Here, a strategy to control the microstructure of solution-processed layered Ruddlesden-Popper-phase perovskite films based on phenethylammonium lead bromide ((PEA)(2) PbBr(4) ) is reported. The method relies on the addition of the organic semiconductor 2,7-dioctyl[1]benzothieno[3,2-b]benzothiophene (C(8) -BTBT) into the perovskite formulation, where it facilitates the formation of large, near-single-crystalline-quality platelet-like (PEA)(2) PbBr(4) domains overlaid by a ≈5-nm-thin C(8) -BTBT layer. Transistors with (PEA)(2) PbBr(4) /C(8) -BTBT channels exhibit an unexpectedly large hysteresis window between forward and return bias sweeps. Material and device analysis combined with theoretical calculations suggest that the C(8) -BTBT-rich phase acts as the hole-transporting channel, while the quantum wells in (PEA)(2) PbBr(4) act as the charge storage element where carriers from the channel are injected, stored, or extracted via tunneling. When tested as a non-volatile memory, the devices exhibit a record memory window (>180 V), a high erase/write channel current ratio (10(4) ), good data retention, and high endurance (>10(4) cycles). The results here highlight a new memory device concept for application in large-area electronics, while the growth technique can potentially be exploited for the development of other optoelectronic devices including solar cells, photodetectors, and light-emitting diodes.
- Published
- 2021
25. Efficient Double- And Triple-Junction Nonfullerene Organic Photovoltaics and Design Guidelines for Optimal Cell Performance
- Author
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Emre Yengel, Mohamad Insan Nugraha, Thomas D. Anthopoulos, Vincent M. Le Corre, Yuanbao Lin, Yuliar Firdaus, Franky So, Carr Hoi Yi Ho, Emre Yarali, and Photophysics and OptoElectronics
- Subjects
Materials science ,Organic solar cell ,Renewable Energy, Sustainability and the Environment ,business.industry ,Triple junction ,Energy Engineering and Power Technology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Bottleneck ,0104 chemical sciences ,Fuel Technology ,Chemistry (miscellaneous) ,Materials Chemistry ,Optoelectronics ,0210 nano-technology ,business - Abstract
The performance of multijunction devices lags behind single-junction organic photovoltaics (OPVs) mainly because of the lack of suitable subcells. Here, we attempt to address this bottleneck and demonstrate efficient nonfullerene-based multijunction OPVs while at the same time highlighting the remaining challenges. We first demonstrate double-junction OPVs with power conversion efficiency (PCE) of 16.5%. Going a step further, we developed triple-junction OPVs with a PCE of 14.9%, the highest value reported to date for this triple-junction cells. Device simulations suggest that improving the front-cell's carrier mobility to >5 × 10-4 cm2 V-1 s-1 is needed to boost the efficiency of double- and triple-junction OPVs. Analysis of the efficiency limit of triple-junction devices predicts that PCE values of close to 26% are possible. To achieve this, however, the optical absorption and charge transport within the subcells would need to be optimized. The work is an important step toward next-generation multijunction OPVs.
- Published
- 2020
26. Heterojunction oxide thin-film transistors
- Author
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Thomas D. Anthopoulos, Emre Yarali, Emre Yengel, and Hendrik Faber
- Subjects
chemistry.chemical_compound ,Materials science ,chemistry ,business.industry ,Thin-film transistor ,Oxide ,Optoelectronics ,Heterojunction ,business - Published
- 2020
27. Stretchable and Transparent Conductive PEDOT:PSS‐Based Electrodes for Organic Photovoltaics and Strain Sensors Applications
- Author
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Thomas D. Anthopoulos, Emre Yengel, Xavier Sallenave, Yuanbao Lin, Cédric Plesse, Emilie Dauzon, Fabrice Goubard, Hendrik Faber, Aram Amassian, King Abdullah University of Science and Technology (KAUST), Laboratoire de Physico-chimie des Polymères et des Interfaces (LPPI), Fédération INSTITUT DES MATÉRIAUX DE CERGY-PONTOISE (I-MAT), Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine, CY Cergy Paris Université (CY)-CY Cergy Paris Université (CY), CY Cergy Paris Université (CY), and Université Paris-Seine
- Subjects
Materials science ,Organic solar cell ,Nanotechnology ,02 engineering and technology ,[CHIM.MATE]Chemical Sciences/Material chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Biomaterials ,[CHIM.POLY]Chemical Sciences/Polymers ,PEDOT:PSS ,Electrode ,Electrochemistry ,0210 nano-technology ,Science, technology and society ,Electrical conductor ,ComputingMilieux_MISCELLANEOUS - Abstract
he authors acknowledge King Abdullah University of Science and Technology (KAUST) for financial support. This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-2018-CARF/CCF-3079.
- Published
- 2020
28. Ledge-directed epitaxy of continuously self-aligned single-crystalline nanoribbons of transition metal dichalcogenides
- Author
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Areej, Aljarb, Jui-Han, Fu, Chih-Chan, Hsu, Chih-Piao, Chuu, Yi, Wan, Mariam, Hakami, Dipti R, Naphade, Emre, Yengel, Chien-Ju, Lee, Steven, Brems, Tse-An, Chen, Ming-Yang, Li, Sang-Hoon, Bae, Wei-Ting, Hsu, Zhen, Cao, Rehab, Albaridy, Sergei, Lopatin, Wen-Hao, Chang, Thomas D, Anthopoulos, Jeehwan, Kim, Lain-Jong, Li, and Vincent, Tung
- Abstract
Two-dimensional transition metal dichalcogenide nanoribbons are touted as the future extreme device downscaling for advanced logic and memory devices but remain a formidable synthetic challenge. Here, we demonstrate a ledge-directed epitaxy (LDE) of dense arrays of continuous, self-aligned, monolayer and single-crystalline MoS
- Published
- 2020
29. 17.1% Efficient Single‐Junction Organic Solar Cells Enabled by n‐Type Doping of the Bulk‐Heterojunction
- Author
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Thomas D. Anthopoulos, Weimin Zhang, Abdul-Hamid M. Emwas, Mohamad Insan Nugraha, Marios Neophytou, Hendrik Faber, Yuliar Firdaus, Yuanbao Lin, Feng Liu, Emre Yengel, Safakath Karuthedath, Akmaral Seitkhan, Frédéric Laquai, Leonidas Tsetseris, and Iain McCulloch
- Subjects
Materials science ,Organic solar cell ,General Chemical Engineering ,General Physics and Astronomy ,Medicine (miscellaneous) ,02 engineering and technology ,molecular doping ,010402 general chemistry ,01 natural sciences ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,Polymer solar cell ,General Materials Science ,lcsh:Science ,Dopant ,business.industry ,Communication ,Doping ,Energy conversion efficiency ,General Engineering ,021001 nanoscience & nanotechnology ,Acceptor ,Communications ,0104 chemical sciences ,Organic semiconductor ,nonfullerene acceptors ,Optoelectronics ,additives ,lcsh:Q ,organic photovoltaics ,0210 nano-technology ,business ,Ternary operation - Abstract
Molecular doping is often used in organic semiconductors to tune their (opto)electronic properties. Despite its versatility, however, its application in organic photovoltaics (OPVs) remains limited and restricted to p‐type dopants. In an effort to control the charge transport within the bulk‐heterojunction (BHJ) of OPVs, the n‐type dopant benzyl viologen (BV) is incorporated in a BHJ composed of the donor polymer PM6 and the small‐molecule acceptor IT‐4F. The power conversion efficiency (PCE) of the cells is found to increase from 13.2% to 14.4% upon addition of 0.004 wt% BV. Analysis of the photoactive materials and devices reveals that BV acts simultaneously as n‐type dopant and microstructure modifier for the BHJ. Under optimal BV concentrations, these synergistic effects result in balanced hole and electron mobilities, higher absorption coefficients and increased charge‐carrier density within the BHJ, while significantly extending the cells' shelf‐lifetime. The n‐type doping strategy is applied to five additional BHJ systems, for which similarly remarkable performance improvements are obtained. OPVs of particular interest are based on the ternary PM6:Y6:PC71BM:BV(0.004 wt%) blend for which a maximum PCE of 17.1%, is obtained. The effectiveness of the n‐doping strategy highlights electron transport in NFA‐based OPVs as being a key issue., Addition of the n‐type dopant benzyl viologen (BV) into several best‐in‐class organic bulk‐heterojunctions (BHJ) is shown to consistently improve the power conversion efficiency (PCE) of the resulting solar cells. The presence of BV inside the BHJs increases the absorption coefficient, balances charge transport, and enhances the charge‐carrier density. These synergistic effects result in organic photovoltaics with a maximum PCE of 17.1%.
- Published
- 2020
30. Self-forming nanogap diodes operate beyond 10 GHz enabled via adhesion lithography (Conference Presentation)
- Author
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Thomas D. Anthopoulos, Shuai Yang, Emre Yengel, Weiwei Li, Azamat Bakytbekov, Atif Shamim, Hendrik Faber, Akmaral Seitkhan, Begimai Adilbekova, Emre Yarali, and Kalaivanan Loganathan
- Subjects
Fabrication ,Materials science ,Equivalent series resistance ,business.industry ,Energy conversion efficiency ,Hardware_INTEGRATEDCIRCUITS ,Optoelectronics ,Schottky diode ,Radio frequency ,business ,Lithography ,Diffusion capacitance ,Diode - Abstract
Harnessing the omnipresent radio frequency (RF) waves intend to explore the new diode technologies as they determine the frequency of operation and ultimately the power conversion efficiency. Recently, a considerable effort focused on performance, reliable and low-cost fabrication methods. Here, we report the fabrication of sub-20 nm co-planar, asymmetric and self-forming nanogap electrodes by adhesion lithography (a-Lith) as an alternative, low-cost and large-area patterning technique. Moreover, solution processing and rapid Flash Lamp Annealing (FLA) route employed to fabricate Schottky diodes. These diodes are having more than 104 On/Off ratio, low series resistance and junction capacitance due to the novel co-planar architecture and thus operating beyond 10 GHz. This paves the way to a radically new diode technology that has a huge impact on the IoT – Wireless Energy Harvesting (WEH) and RFID system.
- Published
- 2020
31. Colossal tunneling electroresistance in co-planar polymer ferroelectric tunnel junctions
- Author
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Aniruddha Basu, Hendrik Faber, Thomas D. Anthopoulos, Kalaivanan Loganathan, Akmaral Seitkhan, Dimitra G. Georgiadou, Kamal Asadi, Emre Yengel, Dipti R Naphade, and Manasvi Kumar
- Subjects
chemistry.chemical_classification ,Materials science ,Foundation (engineering) ,Piezoelectric force microscopy ,02 engineering and technology ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Engineering physics ,Ferroelectricity ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Technical support ,Planar ,chemistry ,0210 nano-technology ,Quantum tunnelling - Abstract
Ferroelectric tunnel junctions (FTJs) are ideal resistance-switching devices due to their deterministic behavior and operation at low voltages. However, FTJs have remained mostly as a scientific curiosity due to three critical issues: lack of rectification in their current-voltage characteristic, small tunneling electroresistance (TER) effect, and absence of a straightforward lithography-based device fabrication method that would allow for their mass production. Co-planar FTJs that are fabricated using wafer-scale adhesion lithography technique are demonstrated, and a bi-stable rectifying behavior with colossal TER approaching 106% at room temperature is exhibited. The FTJs are based on poly(vinylidenefluoride-co-trifluoroethylene) [P(VDF-TrFE)], and employ asymmetric co-planar metallic electrodes separated by
- Published
- 2020
32. Novel wide-bandgap non-fullerene acceptors for efficient tandem organic solar cells
- Author
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Ahmed H. Balawi, Emre Yengel, Feng Liu, Akmaral Seitkhan, Yuliar Firdaus, Vincent M. Le Corre, Yuanbao Lin, Thomas D. Anthopoulos, Frédéric Laquai, Ferry Anggoro Ardy Nugroho, Qiao He, Martin Heeney, Christoph Langhammer, and Photophysics and OptoElectronics
- Subjects
Electron mobility ,Materials science ,Organic solar cell ,Tandem ,Renewable Energy, Sustainability and the Environment ,business.industry ,Band gap ,Open-circuit voltage ,Energy conversion efficiency ,ELECTRON-ACCEPTOR ,RECOMBINATION ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Acceptor ,TRANSPORT ,0104 chemical sciences ,OPEN-CIRCUIT VOLTAGE ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Short circuit - Abstract
The power conversion efficiency (PCE) of tandem organic photovoltaics (OPVs) is currently limited by the lack of suitable wide-bandgap materials for the front-cell. Here, two new acceptor molecules, namely IDTA and IDTTA, with optical bandgaps (Eoptg) of 1.90 and 1.75 eV, respectively, are synthesized and studied for application in OPVs. When PBDB-T is used as the donor polymer, single-junction cells with PCE of 7.4%, for IDTA, and 10.8%, for IDTTA, are demonstrated. The latter value is the highest PCE reported to date for wide-bandgap (Eoptg >= 1.7 eV) bulk-heterojunction OPV cells. The higher carrier mobility in IDTTA-based cells leads to improved charge extraction and higher fill-factor than IDTA-based devices. Moreover, IDTTA-based OPVs show significantly improved shelf-lifetime and thermal stability, both critical for any practical applications. With the aid of optical-electrical device modelling, we combined PBDB-T:IDTTA, as the front-cell, with PTB7-Th:IEICO-4F, as the back-cell, to realize tandem OPVs with open circuit voltage of 1.66 V, short circuit current of 13.6 mA cm(-2) and a PCE of 15%; in excellent agreement with our theoretical predictions. The work highlights IDTTA as a promising wide-bandgap acceptor for high-performance tandem OPVs.
- Published
- 2020
33. A Universal Cosolvent Evaporation Strategy Enables Direct Printing of Perovskite Single Crystals for Optoelectronic Device Applications
- Author
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Daniel Corzo, Tonghui Wang, Murali Gedda, Emre Yengel, Jafar I Khan, Ruipeng Li, Muhammad Rizwan Niazi, Zhengjie Huang, Taesoo Kim, Derya Baran, Dali Sun, Frédéric Laquai, Thomas D. Anthopoulos, and Aram Amassian
- Subjects
Mechanics of Materials ,Mechanical Engineering ,General Materials Science - Abstract
Solution-processed metal halide perovskite (MHP) single crystals (SCs) are in high demand for a growing number of printed electronic applications due to their superior optoelectronic properties compared to polycrystalline thin films. There is an urgent need to make SC fabrication facile, scalable, and compatible with the printed electronic manufacturing infrastructure. Here, a universal cosolvent evaporation (CSE) strategy is presented by which perovskite SCs and arrays are produced directly on substrates via printing and coating methods within minutes at room temperature from drying droplets. The CSE strategy successfully guides the supersaturation via controlled drying of droplets to suppress all crystallization pathways but one, and is shown to produce SCs of a wide variety of 3D, 2D, and mixed-cation/halide perovskites with consistency. This approach works with commonly used precursors and solvents, making it universal. Importantly, the SC consumes the precursor in the droplet, which enables the large-scale fabrication of SC arrays with minimal residue. Direct on-chip fabrication of 3D and 2D perovskite photodetector devices with outstanding performance is demonstrated. The approach shows that any MHP SC can now be manufactured on substrates using precision printing and scalable, high-throughput coating methods.
- Published
- 2022
34. A Low‐Power CuSCN Hydrogen Sensor Operating Reversibly at Room Temperature
- Author
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Thomas D. Anthopoulos, Yuliar Firdaus, George Deligeorgis, Viktoras Kabitakis, Kalaivanan Loganathan, E. Gagaoudakis, Emre Yengel, Leonidas Tsetseris, George Kiriakidis, Vassilios Binas, Marilena Moschogiannaki, Hendrik Faber, and Akmaral Seitkhan
- Subjects
Biomaterials ,chemistry.chemical_compound ,Materials science ,Copper(I) thiocyanate ,chemistry ,business.industry ,Electrochemistry ,Optoelectronics ,Condensed Matter Physics ,business ,Hydrogen sensor ,Electronic, Optical and Magnetic Materials ,Power (physics) - Published
- 2021
35. Inside Perovskites: Quantum Luminescence from Bulk Cs4PbBr6 Single Crystals
- Author
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Emre Yengel, Xiaohe Miao, Buthainah Alshankiti, Yu Han, Yuhai Zhang, Osman M. Bakr, Makhsud I. Saidaminov, Somak Mitra, Bekir Turedi, Ibrahim Dursun, Issam Gereige, Jawaher Almutlaq, Erkki Alarousu, Iman S. Roqan, Omar F. Mohammed, Yihan Zhu, Michele De Bastiani, Jun Yin, Jean-Luc Brédas, and Ahmed Al-Saggaf
- Subjects
Photoluminescence ,Materials science ,business.industry ,General Chemical Engineering ,Quantum yield ,Nanotechnology ,Phosphor ,02 engineering and technology ,General Chemistry ,Electroluminescence ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Materials Chemistry ,Optoelectronics ,Emission spectrum ,0210 nano-technology ,business ,Luminescence ,Quantum ,Perovskite (structure) - Abstract
Zero-dimensional perovskite-related structures (0D-PRS) are a new frontier of perovskite-based materials. 0D-PRS, commonly synthesized in powder form, manifest distinctive optical properties such as strong photoluminescence (PL), narrow emission line width, and high exciton binding energy. These properties make 0D-PRS compelling for several types of optoelectronic applications, including phosphor screens and electroluminescent devices. However, it would not be possible to rationally design the chemistry and structure of these materials, without revealing the origins of their optical behavior, which is contradictory to the well-studied APbX3 perovskites. In this work, we synthesize single crystals of Cs4PbBr6 0D-PRS, and investigated the origins of their unique optical and electronic properties. The crystals exhibit a PL quantum yield higher than 40%, the highest reported for perovskite-based single crystals. Time-resolved and temperature dependent PL studies, supported by DFT calculations, and structural ...
- Published
- 2017
36. Pyridine-Induced Dimensionality Change in Hybrid Perovskite Nanocrystals
- Author
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Osman M. Bakr, Emre Yengel, Ghada H. Ahmed, Riya Bose, Makhsud I. Saidaminov, Noktan M. Alyami, Jun Yin, Yuhai Zhang, Mohamed N. Hedhili, Lutfan Sinatra, Erkki Alarousu, Omar F. Mohammed, and Jean-Luc Brédas
- Subjects
Nanostructure ,Photoluminescence ,Materials science ,General Chemical Engineering ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surface energy ,0104 chemical sciences ,chemistry.chemical_compound ,Nanocrystal ,chemistry ,Chemical physics ,Quantum dot ,Pyridine ,Materials Chemistry ,Density functional theory ,0210 nano-technology ,Perovskite (structure) - Abstract
Engineering the surface energy through careful manipulation of the surface chemistry is a convenient approach to control quantum confinement and structure dimensionality during nanocrystal growth. Here, we demonstrate that the introduction of pyridine during the synthesis of methylammonium lead bromide (MAPbBr3) perovskite nanocrystals can transform three-dimensional (3D) cubes into two-dimensional (2D) nanostructures. Density functional theory (DFT) calculations show that pyridine preferentially binds to Pb atoms terminating the surface, driving the selective 2D growth of the nanostructures. These 2D nanostructures exhibit strong quantum confinement effects, high photoluminescence quantum yields in the visible spectral range, and efficient charge transfer to molecular acceptors. These qualities indicate the suitability of the synthesized 2D nanostructures for a wide range of optoelectronic applications.
- Published
- 2017
37. The Surface of Hybrid Perovskite Crystals: A Boon or Bane
- Author
-
Wei Peng, Osman M. Bakr, Omar F. Mohammed, Emre Yengel, Banavoth Murali, Erkki Alarousu, and Chen Yang
- Subjects
Surface (mathematics) ,Electron mobility ,Passivation ,Renewable Energy, Sustainability and the Environment ,Chemistry ,Energy Engineering and Power Technology ,Surface hydration ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Ambient air ,Fuel Technology ,Chemistry (miscellaneous) ,Materials Chemistry ,Charge carrier ,0210 nano-technology ,Single crystal ,Perovskite (structure) - Abstract
Hybrid perovskite single crystals have garnered tremendous research attention and are expected to be next-generation materials for high-efficiency photoactive devices. Therefore, it is fundamentally important to understand the relationship between the optoelectronic properties of these materials and the marginally exploited surface chemistry in ambient air. For instance, a strong surface disorder, including hydration and ion migration, can possibly lead to extremely different optical and electronic properties at the surface compared to the bulk of the single crystal (SC). From this perspective, we evaluate the key variables that underlie the perovskite SC surface restructuring in ambient air and discuss their merits and limitations. In addition, a comprehensive picture of surface disordering, the remarkable change in the charge carrier dynamics and carrier mobility, surface hydration, and the effect of ion migration on the surface behavior will be discussed. Finally, surface passivation methods are highli...
- Published
- 2017
38. Zero-Dimensional Cs4PbBr6 Perovskite Nanocrystals
- Author
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Emre Yengel, Buthainah Alshankiti, Banavoth Murali, Omar F. Mohammed, Osman M. Bakr, Erkki Alarousu, Makhsud I. Saidaminov, Yuhai Zhang, Haoze Yang, and Ibrahim Dursun
- Subjects
Materials science ,Photoluminescence ,business.industry ,Quantum yield ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Semiconductor ,Nanocrystal ,Phase (matter) ,General Materials Science ,Microemulsion ,Physical and Theoretical Chemistry ,Thin film ,0210 nano-technology ,business ,Perovskite (structure) - Abstract
Perovskite nanocrystals (NCs) have become leading candidates for solution-processed optoelectronics applications. While substantial work has been published on 3-D perovskite phases, the NC form of the zero-dimensional (0-D) phase of this promising class of materials remains elusive. Here we report the synthesis of a new class of colloidal semiconductor NCs based on Cs4PbBr6, the 0-D perovskite, enabled through the design of a novel low-temperature reverse microemulsion method with 85% reaction yield. These 0-D perovskite NCs exhibit high photoluminescence quantum yield (PLQY) in the colloidal form (PLQY: 65%), and, more importantly, in the form of thin film (PLQY: 54%). Notably, the latter is among the highest values reported so far for perovskite NCs in the solid form. Our work brings the 0-D phase of perovskite into the realm of colloidal NCs with appealingly high PLQY in the film form, which paves the way for their practical application in real devices.
- Published
- 2017
39. Temperature-Induced Lattice Relaxation of Perovskite Crystal Enhances Optoelectronic Properties and Solar Cell Performance
- Author
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Emre Yengel, Victor M. Burlakov, Wei Peng, Mohd Sharizal Alias, Boon S. Ooi, Osman M. Bakr, Mohamed Eddaoudi, Erkki Alarousu, Alain Goriely, Omar F. Mohammed, Zhijie Chen, and Banavoth Murali
- Subjects
Photocurrent ,Electron mobility ,Materials science ,Passivation ,business.industry ,02 engineering and technology ,Atmospheric temperature range ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,Crystal ,law ,Lattice (order) ,Solar cell ,Optoelectronics ,General Materials Science ,Charge carrier ,Physical and Theoretical Chemistry ,0210 nano-technology ,business - Abstract
Hybrid organic-inorganic perovskite crystals have recently become one of the most important classes of photoactive materials in the solar cell and optoelectronic communities. Albeit improvements have focused on state-of-the-art technology including various fabrication methods, device architectures, and surface passivation, progress is yet to be made in understanding the actual operational temperature on the electronic properties and the device performances. Therefore, the substantial effect of temperature on the optoelectronic properties, charge separation, charge recombination dynamics, and photoconversion efficiency are explored. The results clearly demonstrated a significant enhancement in the carrier mobility, photocurrent, charge carrier lifetime, and solar cell performance in the 60 ± 5 °C temperature range. In this temperature range, perovskite crystal exhibits a highly symmetrical relaxed cubic structure with well-aligned domains that are perpendicular to a principal axis, thereby remarkably improving the device operation. This finding provides a new key variable component and paves the way toward using perovskite crystals in highly efficient photovoltaic cells.
- Published
- 2016
40. Surface Restructuring of Hybrid Perovskite Crystals
- Author
-
Wei Peng, Mohd Sharizal Alias, Namchul Cho, Jingya Sun, Emre Yengel, Banavoth Murali, Sukumar Dey, Ayan A. Zhumekenov, Omar F. Mohammed, Aram Amassian, Ahmed L. Abdelhady, Manas R. Parida, Boon S. Ooi, Makhsud I. Saidaminov, Ahmad R. Kirmani, Erkki Alarousu, Osman M. Bakr, and Smritakshi P. Sarmah
- Subjects
Photocurrent ,Resistive touchscreen ,Renewable Energy, Sustainability and the Environment ,Band gap ,business.industry ,Energy Engineering and Power Technology ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Microstructure ,01 natural sciences ,0104 chemical sciences ,law.invention ,Fuel Technology ,Semiconductor ,Chemistry (miscellaneous) ,law ,Solar cell ,Materials Chemistry ,Scanning tunneling microscope ,0210 nano-technology ,business ,Perovskite (structure) - Abstract
Hybrid perovskite crystals have emerged as an important class of semiconductors because of their remarkable performance in optoelectronics devices. The interface structure and chemistry of these crystals are key determinants of the device’s performance. Unfortunately, little is known about the intrinsic properties of the surfaces of perovskite materials because extrinsic effects, such as complex microstructures, processing conditions, and hydration under ambient conditions, are thought to cause resistive losses and high leakage current in solar cells. We reveal the intrinsic structural and optoelectronic properties of both pristinely cleaved and aged surfaces of single crystals. We identify surface restructuring on the aged surfaces (visualized on the atomic-scale by scanning tunneling microscopy) that lead to compositional and optical bandgap changes as well as degradation of carrier dynamics, photocurrent, and solar cell device performance. The insights reported herein clarify the key variables involved...
- Published
- 2016
41. Recent progress in photonic processing of metal‐oxide transistors
- Author
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Emre Yarali, Hendrik Faber, Panos Patsalas, Demosthenes C. Koutsogeorgis, Emre Yengel, Nikolaos Kalfagiannis, Christina Koutsiaki, Kornelius Tetzner, and Thomas D. Anthopoulos
- Subjects
Materials science ,Oxide ,Nanotechnology ,02 engineering and technology ,Substrate (electronics) ,010402 general chemistry ,01 natural sciences ,law.invention ,Biomaterials ,chemistry.chemical_compound ,law ,Electrochemistry ,Electronics ,Rapid manufacturing ,business.industry ,Transistor ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,chemistry ,Thin-film transistor ,Photonics ,0210 nano-technology ,business ,Electronic materials - Abstract
Over the past few decades, significant progress has been made in the field of photonic processing of electronic materials using a variety of light sources. Several of these technologies have now been exploited in conjunction with emerging electronic materials as alternatives to conventional high temperature thermal annealing offering rapid manufacturing times and compatibility with temperature-sensitive substrate materials among other potential advantages. A review of recent advances in photonic processing paradigms of metal oxide thin film transistors (TFTs), is presented with particular emphasis on the use of various light source technologies for the photochemical and thermochemical conversion of precursor materials or post-deposition treatment of metal oxides and their application in thin-film electronics. The pros and cons of the different technologies are discussed in light of recent developments and prospective research in the field of modern large-area electronics is highlighted.
- Published
- 2019
42. Organic Tandem Solar Cells with 15% Efficiency Employing Novel Wide Bandgap Nonfullerene Acceptor
- Author
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Emre Yengel, Christoph Langhammer, Ferry Anggoro Ardy Nugroho, Qiao He, Yuanbao Lin, Frédéric Laquai, Yuliar Firdaus, Thomas D. Anthopoulos, Ahmed H. Balawi, Martin Heeney, and Feng Liu
- Subjects
Materials science ,Tandem ,Band gap ,business.industry ,Optoelectronics ,business ,Acceptor - Published
- 2019
43. Rapid Photonic Curing for the Fabrication of Strongly-Confined Colloidal Quantum Dot Transistors with High Carrier Mobility
- Author
-
Thomas D. Anthopolous, Emre Yarali, Abdulrahman El-Labban, Mohamad Insan Nugraha, Emre Yengel, Nimer Wehbe, Yuanbao Lin, and Yuliar Firdaus
- Subjects
Colloid ,Electron mobility ,Fabrication ,Materials science ,law ,Quantum dot ,business.industry ,Transistor ,Optoelectronics ,Photonics ,business ,Curing (chemistry) ,law.invention - Published
- 2019
44. Aqueous ammonia-based exfoliation of two dimensional MoS2 and WS2 and their application in non-fullerene organic solar cells
- Author
-
Hendrik Faber, Yuliar Firdaus, Thomas D. Anthopoulos, Emre Yengel, Begimai Adilbekova, Yuanbao Lin, Vincent Tung, and George T. Harrison
- Subjects
Ammonia ,chemistry.chemical_compound ,Aqueous solution ,Fullerene ,Materials science ,Organic solar cell ,chemistry ,Chemical engineering ,Exfoliation joint - Published
- 2019
45. 17% Efficient Organic Solar Cells Based on Liquid Exfoliated WS
- Author
-
Yuanbao, Lin, Begimai, Adilbekova, Yuliar, Firdaus, Emre, Yengel, Hendrik, Faber, Muhammad, Sajjad, Xiaopeng, Zheng, Emre, Yarali, Akmaral, Seitkhan, Osman M, Bakr, Abdulrahman, El-Labban, Udo, Schwingenschlögl, Vincent, Tung, Iain, McCulloch, Frédéric, Laquai, and Thomas D, Anthopoulos
- Abstract
The application of liquid-exfoliated 2D transition metal disulfides (TMDs) as the hole transport layers (HTLs) in nonfullerene-based organic solar cells is reported. It is shown that solution processing of few-layer WS
- Published
- 2019
46. Multi-Input Parameter Modulable Memtransistors from Hybrid Perovskite/Conjugated Polymer Heterostructures
- Author
-
Emre Yengel, Jafar Iqbal Khan, Thomas D. Anthopoulos, Chun Ma, Hu Chen, Weiming Zhang, Hendrik Faber, Frédéric Laquai, and Iain McCulloch
- Subjects
chemistry.chemical_classification ,Materials science ,chemistry ,business.industry ,Multi input ,Optoelectronics ,Heterojunction ,Polymer ,Conjugated system ,business ,Perovskite (structure) - Published
- 2019
47. Scaling-up perovskite solar cells on hydrophobic surfaces
- Author
-
Emre Yengel, Thomas D. Anthopoulos, George T. Harrison, Shynggys Zhumagali, Mathan Kumar Eswaran, Frédéric Laquai, Furkan Halis Isikgor, Stefaan De Wolf, Jiang Liu, Aslihan Babayigit, Anand S. Subbiah, Calvyn Travis Howells, Michele De Bastiani, Udo Schwingenschlögl, Iain McCulloch, Jafar Iqbal Khan, and Francesco Furlan
- Subjects
Materials science ,Inkwell ,Renewable Energy, Sustainability and the Environment ,Polarity (physics) ,Binding energy ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Adduct ,Chemical engineering ,Hydrophobic surfaces ,General Materials Science ,Electrical and Electronic Engineering ,0210 nano-technology ,Layer (electronics) ,Scaling ,Perovskite (structure) - Abstract
Despite impressive power conversion efficiencies (PCEs) reported for lab-scale perovskite solar cells (PSCs), obtaining large-area devices with similar performance remains challenging. Fundamentally, this can largely be attributed to a polarity mismatch between the perovskite-precursor solution and the underlying hydrophobic contact materials, resulting in perovskite films of insufficient quality for scaled devices. Specifically, for p-i-n devices, the commonly used DMF/DMSO co-solvent has a significant polarity mismatch with its underlying hole-transporting layer, PTAA. Here, the role of MAPbI3•solvent adduct interaction with the PTAA surface towards the formation of micro- and nano-scale pinholes is elucidated in detail. Replacing DMSO with NMP in the co-solvent system changes the binding energy profoundly, enabling uniform and dense films over large areas. The PCE of DMF/NMP ink-based devices drops slightly with increasing active device area, from 21.5% (0.1 cm2) to 19.8% (6.8 cm2), in comparison with conventional DMF/DMSO ink. This work opens a pathway towards the scalability of solution-processed perovskite optoelectronic devices.
- Published
- 2021
48. Optoelectronic Ferroelectric Domain‐Wall Memories Made from a Single Van Der Waals Ferroelectric
- Author
-
Thomas D. Anthopoulos, Emre Yengel, Fei Xue, Lain-Jong Li, Mingguang Chen, Jr-Hau He, Dharmaraj Periyanagounder, Xixiang Zhang, Xin He, Chun-Ho Lin, Vincent Tung, Linqu Luo, Chenhui Zhang, and Wenhao Liu
- Subjects
Materials science ,business.industry ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Ferroelectricity ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Biomaterials ,Domain wall (string theory) ,symbols.namesake ,Electrochemistry ,symbols ,Optoelectronics ,van der Waals force ,0210 nano-technology ,business - Abstract
The research presented here was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: CRF-2015-2634-CRG4 and CRF-2016-2996-CRG5. J. H. H. thanks the financial support from City University of Hong Kong.
- Published
- 2020
49. Low‐Voltage Heterojunction Metal Oxide Transistors via Rapid Photonic Processing
- Author
-
Thomas D. Anthopoulos, Yuliar Firdaus, George T. Harrison, Emre Yarali, Emre Yengel, Yuanbao Lin, Kalaivanan Loganathan, Chun Ma, Begimai Adilbekova, Hendrik Faber, and Akmaral Seitkhan
- Subjects
Materials science ,business.industry ,Transistor ,Oxide ,Heterojunction ,Electronic, Optical and Magnetic Materials ,law.invention ,Metal ,chemistry.chemical_compound ,chemistry ,Thin-film transistor ,law ,visual_art ,visual_art.visual_art_medium ,Optoelectronics ,Photonics ,business ,Low voltage - Published
- 2020
50. Large-area plastic nanogap electronics enabled by adhesion lithography
- Author
-
Thomas D. Anthopoulos, Donal D. C. Bradley, Francesca Bottacchi, Dimitra G. Georgiadou, Stephan Rossbauer, Gwenhivir Wyatt-Moon, Akmaral Seitkhan, Martyn A. McLachlan, Minho Yoon, Emre Yengel, and James Semple
- Subjects
Materials science ,TK7800-8360 ,lcsh:TK7800-8360 ,Nanotechnology ,Hardware_PERFORMANCEANDRELIABILITY ,02 engineering and technology ,Substrate (electronics) ,010402 general chemistry ,01 natural sciences ,law.invention ,law ,Hardware_INTEGRATEDCIRCUITS ,General Materials Science ,Electronics ,Electrical and Electronic Engineering ,Materials of engineering and construction. Mechanics of materials ,Lithography ,Diode ,Electronic circuit ,lcsh:Electronics ,Transistor ,021001 nanoscience & nanotechnology ,Flexible electronics ,0104 chemical sciences ,Printed electronics ,TA401-492 ,0210 nano-technology ,Hardware_LOGICDESIGN - Abstract
Large-area manufacturing of flexible nanoscale electronics has long been sought by the printed electronics industry. However, the lack of a robust, reliable, high throughput and low-cost technique that is capable of delivering high-performance functional devices has hitherto hindered commercial exploitation. Herein we report on the extensive range of capabilities presented by adhesion lithography (a-Lith), an innovative patterning technique for the fabrication of coplanar nanogap electrodes with arbitrarily large aspect ratio. We use this technique to fabricate a plethora of nanoscale electronic devices based on symmetric and asymmetric coplanar electrodes separated by a nanogap
- Published
- 2018
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