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Start Over Author "Salleo, Alberto" Journal journal of the american chemical society
27 results on '"Salleo, Alberto"'

2. Efficient Electronic Tunneling Governs Transport in Conducting Polymer-Insulator Blends

Author

Keene, Scott T, Michaels, Wesley, Melianas, Armantas, Quill, Tyler J, Fuller, Elliot J, Giovannitti, Alexander, McCulloch, Iain, Talin, A Alec, Tassone, Christopher J, Qin, Jian, Troisi, Alessandro, Salleo, Alberto, Keene, Scott T [0000-0002-6635-670X], Quill, Tyler J [0000-0003-2906-0747], Giovannitti, Alexander [0000-0003-4778-3615], McCulloch, Iain [0000-0002-6340-7217], Talin, A Alec [0000-0002-1102-680X], Qin, Jian [0000-0001-6271-068X], Troisi, Alessandro [0000-0002-5447-5648], and Apollo - University of Cambridge Repository

Subjects
3403 Macromolecular and Materials Chemistry, Colloid and Surface Chemistry, 34 Chemical Sciences, General Chemistry, Biochemistry, 4016 Materials Engineering, Catalysis, 40 Engineering
Abstract

Electronic transport models for conducting polymers (CPs) and blends focus on the arrangement of conjugated chains, while the contributions of the nominally insulating components to transport are largely ignored. In this work, an archetypal CP blend is used to demonstrate that the chemical structure of the non-conductive component has a substantial effect on charge carrier mobility. Upon diluting a CP with excess insulator, blends with as high as 97.4 wt % insulator can display carrier mobilities comparable to some pure CPs such as polyaniline and low regioregularity P3HT. In this work, we develop a single, multiscale transport model based on the microstructure of the CP blends, which describes the transport properties for all dilutions tested. The results show that the high carrier mobility of primarily insulator blends results from the inclusion of aromatic rings, which facilitate long-range tunneling (up to ca. 3 nm) between isolated CP chains. This tunneling mechanism calls into question the current paradigm used to design CPs, where the solubilizing or ionically conducting component is considered electronically inert. Indeed, optimizing the participation of the nominally insulating component in electronic transport may lead to enhanced electronic mobility and overall better performance in CPs.

Published
2022
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3. High-Performance Humidity Sensing in π-Conjugated Molecular Assemblies through the Engineering of Electron/Proton Transport and Device Interfaces

Author

Turetta, Nicholas, primary, Stoeckel, Marc-Antoine, additional, Furlan de Oliveira, Rafael, additional, Devaux, Félix, additional, Greco, Alessandro, additional, Cendra, Camila, additional, Gullace, Sara, additional, Gicevičius, Mindaugas, additional, Chattopadhyay, Basab, additional, Liu, Jie, additional, Schweicher, Guillaume, additional, Sirringhaus, Henning, additional, Salleo, Alberto, additional, Bonn, Mischa, additional, Backus, Ellen H. G., additional, Geerts, Yves H., additional, and Samorì, Paolo, additional

Published
2022
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5. Modification of Indacenodithiophene-Based Polymers and Its Impact on Charge Carrier Mobility in Organic Thin-Film Transistors

Author

Wadsworth, Andrew, primary, Chen, Hu, additional, Thorley, Karl J., additional, Cendra, Camila, additional, Nikolka, Mark, additional, Bristow, Helen, additional, Moser, Maximilian, additional, Salleo, Alberto, additional, Anthopoulos, Thomas D., additional, Sirringhaus, Henning, additional, and McCulloch, Iain, additional

Published
2019
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6. The Effect of Ring Expansion in Thienobenzo[b]indacenodithiophene Polymers for Organic Field-Effect Transistors

Author

Chen, Hu, primary, Wadsworth, Andrew, additional, Ma, Chun, additional, Nanni, Alice, additional, Zhang, Weimin, additional, Nikolka, Mark, additional, Luci, Alexander M. T., additional, Perdigão, Luís M. A., additional, Thorley, Karl J., additional, Cendra, Camila, additional, Larson, Bryon, additional, Rumbles, Garry, additional, Anthopoulos, Thomas D., additional, Salleo, Alberto, additional, Costantini, Giovanni, additional, Sirringhaus, Henning, additional, and McCulloch, Iain, additional

Published
2019
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7. Indacenodithiophene semiconducting polymers for high-performance, air-stable transistors

Author

Weimin Zhang, Smith, Jeremy, Watkins, Scott E., Gysel, Roman, McGehee, Michael, Salleo, Alberto, Kirkpatrick, James, Ashraf, Shahid, Anthopoulos, Thomas, Heeney, Martin, and McCulloch, Iain

Subjects
Diazo compounds -- Chemical properties, Diazo compounds -- Electric properties, Optoelectronics -- Analysis, Organic semiconductors -- Structure, Organic semiconductors -- Chemical properties, Thin film devices -- Structure, Thin film devices -- Chemical properties, Thiophene -- Structure, Thiophene -- Chemical properties, Thiophene -- Electric properties, Chemistry
Abstract

The synthesis and properties of various different indacenodithiophene semiconducting polymers are discussed. These polymers are shown to be extremely efficient and hence can be used in the next-generation organic optoelectronics.

Published
2010

8. Lamination method for the study of interfaces in polymeric thin film transistors

Author

Chabinyc, Michael L., Salleo, Alberto, Yiliang Wu, Ping Liu, Beng S. Ong, Heeney, Martin, and McCulloch, Iain

Subjects
Elastomers -- Research, Elastomers -- Electric properties, Dielectric films -- Research, Thin films -- Research, Polymers -- Research, Polymers -- Electric properties, Chemistry
Abstract

A method is presented to laminate polymeric semiconducting films using an elastomeric support made of poly(di-methylsiloxane) (PDMS). These techniques have enabled the study of interfacial interactions in polymeric thin film transistors.

Published
2004

10. Modification of Indacenodithiophene-Based Polymers and Its Impact on Charge Carrier Mobility in Organic Thin-Film Transistors

Author

Wadsworth, Andrew, Chen, Hu, Thorley, Karl J., Cendra, Camila, Nikolka, Mark, Bristow, Helen, Moser, Maximilian, Salleo, Alberto, Anthopoulos, Thomas D., Sirringhaus, Henning, and McCulloch, Iain

Abstract

The polymer indacenodithiophene-co-benzothiadiazole (IDT-BT) has been thoroughly studied for its use in p-type organic thin-film transistors over the course of the past decade. While a variety of modifications have been made to its structure, few analogues have been able to match or surpass the hole mobility that can be obtained by IDT-BT. Here, we discuss the rationale behind the chemical modifications that have been utilized and suggest design principles toward high-mobility indacenodithiophene-based polymers. It is clear that planarizing intramolecular interactions, which exist between the peripheral thiophene of the IDT unit and the benzothiadiazole, are imperative for achieving high hole mobilities in this relatively amorphous polymer. Moreover, despite the less ordered backbones of the extended fused-ring cores that have recently been utilized (TIF-BT and TBIDT-BT), high mobilities were still attained in these polymers owing to additional interchain charge transfer. Thus, maintaining the beneficial thiophene–benzothiadiazole intramolecular interactions, while further extending the IDT core to promote interchain charge transfer, is a logical strategy toward high-mobility p-type polymers.

Published
2020
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11. Direct Correlation of Charge Transfer Absorption with Molecular Donor:Acceptor Interfacial Area via Photothermal Deflection Spectroscopy

Author

Buchaca-Domingo, Ester, primary, Vandewal, Koen, additional, Fei, Zhuping, additional, Watkins, Scott E., additional, Scholes, Fiona H., additional, Bannock, James H., additional, de Mello, John C., additional, Richter, Lee J., additional, DeLongchamp, Dean M., additional, Amassian, Aram, additional, Heeney, Martin, additional, Salleo, Alberto, additional, and Stingelin, Natalie, additional

Published
2015
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12. Symmetry-Breaking Charge Transfer in a Zinc Chlorodipyrrin Acceptor for High Open Circuit Voltage Organic Photovoltaics

Author

Bartynski, Andrew N., primary, Gruber, Mark, additional, Das, Saptaparna, additional, Rangan, Sylvie, additional, Mollinger, Sonya, additional, Trinh, Cong, additional, Bradforth, Stephen E., additional, Vandewal, Koen, additional, Salleo, Alberto, additional, Bartynski, Robert A., additional, Bruetting, Wolfgang, additional, and Thompson, Mark E., additional

Published
2015
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13. Correction to “A New Tetracyclic Lactam Building Block for Thick, Broad-Bandgap Photovoltaics”

Author

Kroon, Renee, primary, Diaz de Zerio Mendaza, Amaia, additional, Himmelberger, Scott, additional, Bergqvist, Jonas, additional, Bäcke, Olof, additional, Faria, Gregório Couto, additional, Gao, Feng, additional, Obaid, Abdulmalik, additional, Zhuang, Wenliu, additional, Gedefaw, Desta, additional, Olsson, Eva, additional, Inganäs, Olle, additional, Salleo, Alberto, additional, Müller, Christian, additional, and Andersson, Mats R., additional

Published
2015
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14. A New Tetracyclic Lactam Building Block for Thick, Broad-Bandgap Photovoltaics

Author

Kroon, Renee, primary, Diaz de Zerio Mendaza, Amaia, additional, Himmelberger, Scott, additional, Bergqvist, Jonas, additional, Bäcke, Olof, additional, Faria, Gregório Couto, additional, Gao, Feng, additional, Obaid, Abdulmalik, additional, Zhuang, Wenliu, additional, Gedefaw, Desta, additional, Olsson, Eva, additional, Inganäs, Olle, additional, Salleo, Alberto, additional, Müller, Christian, additional, and Andersson, Mats R., additional

Published
2014
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15. Importance of the Donor:Fullerene Intermolecular Arrangement for High-Efficiency Organic Photovoltaics

Author

Graham, Kenneth R., primary, Cabanetos, Clement, additional, Jahnke, Justin P., additional, Idso, Matthew N., additional, El Labban, Abdulrahman, additional, Ngongang Ndjawa, Guy O., additional, Heumueller, Thomas, additional, Vandewal, Koen, additional, Salleo, Alberto, additional, Chmelka, Bradley F., additional, Amassian, Aram, additional, Beaujuge, Pierre M., additional, and McGehee, Michael D., additional

Published
2014
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16. The Role of Regioregularity, Crystallinity, and Chain Orientation on Electron Transport in a High-Mobility n-Type Copolymer

Author

Steyrleuthner, Robert, primary, Di Pietro, Riccardo, additional, Collins, Brian A., additional, Polzer, Frank, additional, Himmelberger, Scott, additional, Schubert, Marcel, additional, Chen, Zhihua, additional, Zhang, Shiming, additional, Salleo, Alberto, additional, Ade, Harald, additional, Facchetti, Antonio, additional, and Neher, Dieter, additional

Published
2014
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18. Photocurrent Enhancement from Diketopyrrolopyrrole Polymer Solar Cells through Alkyl-Chain Branching Point Manipulation

Author

Meager, Iain, primary, Ashraf, Raja Shahid, additional, Mollinger, Sonya, additional, Schroeder, Bob C., additional, Bronstein, Hugo, additional, Beatrup, Daniel, additional, Vezie, Michelle S., additional, Kirchartz, Thomas, additional, Salleo, Alberto, additional, Nelson, Jenny, additional, and McCulloch, Iain, additional

Published
2013
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20. Controlled Conjugated Backbone Twisting for an Increased Open-Circuit Voltage while Having a High Short-Circuit Current in Poly(hexylthiophene) Derivatives

Author

Ko, Sangwon, primary, Hoke, Eric T., additional, Pandey, Laxman, additional, Hong, Sanghyun, additional, Mondal, Rajib, additional, Risko, Chad, additional, Yi, Yuanping, additional, Noriega, Rodrigo, additional, McGehee, Michael D., additional, Brédas, Jean-Luc, additional, Salleo, Alberto, additional, and Bao, Zhenan, additional

Published
2012
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25. A New Tetracyclic Lactam Building Block for Thick, Broad-Bandgap Photovoltaics

Author

Scott Himmelberger, Amaia Diaz de Zerio Mendaza, Mats Andersson, Alberto Salleo, Gregório Couto Faria, Abdulmalik Obaid, Feng Gao, Olof Bäcke, Jonas Bergqvist, Renee Kroon, Christian Müller, Eva Olsson, Desta Antenehe Gedefaw, Olle Inganäs, Wenliu Zhuang, Kroon, Renee, Diaz De Zerio, Mendaza A, Himmelberger, Scott, Bergqvist, Jonas, Backe, Olof, Faria, Gregório Couto, Gao, Feng, Obaid, Abdulmalik, Zhuang, Wenliu, Gedefaw, Desta, Olsson, Eva, Inganäs, Olle, Salleo, Alberto, Muller, Christian, and Andersson, Mats R

Subjects
Nanostructure, Fullerene, Band gap, thick active layers, Biochemistry, Catalysis, power conversion efficiencies, chemistry.chemical_compound, Colloid and Surface Chemistry, Photovoltaics, charge separations, Organic chemistry, Thin film, chemistry.chemical_classification, polymer semiconductors, business.industry, Chemistry, Energy conversion efficiency, polymer backbones, General Chemistry, Polymer, wide angle X-ray scattering, CÉLULAS SOLARES, organic electronic materials, grazing incidence, Lactam, Optoelectronics, business
Abstract

A new tetracyclic lactam building block for polymer semiconductors is reported that was designed to combine the many favorable properties that larger fused and/or amide-containing building blocks can induce, including improved solid-state packing, high charge carrier mobility, and improved charge separation. Copolymerization with thiophene resulted in a semicrystalline conjugated polymer, PTNT, with a broad bandgap of 2.2 eV. Grazing incidence wide-angle X-ray scattering of PTNT thin films revealed a strong tendency for face-on π- stacking of the polymer backbone, which was retained in PTNT:fullerene blends. Corresponding solar cells featured a high open-circuit voltage of 0.9 V, a fill factor around 0.6, and a power conversion efficiency as high as 5% for >200 nm thick active layers, regardless of variations in blend stoichiometry and nanostructure. Moreover, efficiencies of >4% could be retained when thick active layers of ∼400 nm were employed. Overall, these values are the highest reported for a conjugated polymer with such a broad bandgap and are unprecedented in materials for tandem and particularly ternary blend photovoltaics. Hence, the newly developed tetracyclic lactam unit has significant potential as a conjugated building block in future organic electronic materials. Refereed/Peer-reviewed

Published
2014
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26. Very Low Band Gap Thiadiazoloquinoxaline Donor–Acceptor Polymers as Multi-tool Conjugated Polymers

Author

Patrik Henriksson, Alberto Salleo, Timothy T. Steckler, Sonya Mollinger, Mats Andersson, Angelica Lundin, Steckler, Timothy T, Henriksson, Patrik, Mollinger, Sonya, Lundin, Angelica, Salleo, Alberto, and Andersson, Mats R

Subjects
azo compounds, Polymers, Band gap, molecular structure, Conjugated system, Photochemistry, Biochemistry, Oligomer, Catalysis, Switching time, chemistry.chemical_compound, Colloid and Surface Chemistry, Quinoxalines, polymers, chemistry.chemical_classification, Molecular Structure, Ambipolar diffusion, business.industry, General Chemistry, Polymer, quantum theory, Acceptor, chemistry, Electrochromism, Quantum Theory, Optoelectronics, quinoxalines, business, Azo Compounds
Abstract

Here we report on the synthesis of two novel very low band gap (VLG) donor–acceptor polymers (Eg ≤ 1 eV) and an oligomer based on the thiadiazoloquinoxaline acceptor. Both polymers demonstrate decent ambipolar mobilities, with P1 showing the best performance of ∼10–2 cm2 V–1 s–1 for p- and n-type operation. These polymers are among the lowest band gap polymers (≲0.7 eV) reported, with a neutral λmax = 1476 nm (P2), which is the farthest red-shifted λmax reported to date for a soluble processable polymer. Very little has been done to characterize the electrochromic aspects of VLG polymers; interestingly, these polymers actually show a bleaching of their neutral absorptions in the near-infrared region and have an electrochromic contrast up to 30% at a switching speed of 3 s. Refereed/Peer-reviewed

Published
2014
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27. The Effect of Ring Expansion in Thienobenzo[ b ]indacenodithiophene Polymers for Organic Field-Effect Transistors.

Author

Chen H, Wadsworth A, Ma C, Nanni A, Zhang W, Nikolka M, Luci AMT, Perdigão LMA, Thorley KJ, Cendra C, Larson B, Rumbles G, Anthopoulos TD, Salleo A, Costantini G, Sirringhaus H, and McCulloch I

Abstract

A fused donor, thienobenzo[ b ]indacenodithiophene ( TBIDT ), was designed and synthesized using a novel acid-promoted cascade ring closure strategy, and then copolymerized with a benzothiadiazole ( BT ) monomer. The backbone of TBIDT is an expansion of the well-known indacenodithiophene ( IDT ) unit and was expected to enhance the charge carrier mobility by improving backbone planarity and facilitating short contacts between polymer chains. However, the optimized field-effect transistors demonstrated an average saturation hole mobility of 0.9 cm 2 V -1 s -1 , lower than the performance of IDT-BT (∼1.5 cm 2 V -1 s -1 ). Mobilities extracted from time-resolved microwave conductivity measurements were consistent with the trend in hole mobilities in organic field-effect transistor devices. Scanning tunneling microscopy measurements and computational modeling illustrated that TBIDT-BT exhibits a less ordered microstructure in comparison to IDT-BT . This reveals that a regular side-chain packing density, independent of conformational isomers, is critical to avoid local free volume due to irregular packing, which can host trapping impurities. DFT calculations indicated that TBIDT-BT , despite containing a larger, planar unit, showed less stabilization of planar backbone geometries in comparison to IDT-BT . This is due to the reduced electrostatic stabilizing interactions between the peripheral thiophene of the fused core and the BT unit, resulting in a reduction of the barrier to rotation around the single bond. These insights provide a greater understanding of the general structure-property relationships required for semiconducting polymer repeat units to ensure optimal backbone planarization, as illustrated with IDT -type units, guiding the design of novel semiconducting polymers with extended fused backbones for high-performance field-effect transistors.

Published
2019
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