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3. Subsurface Characteristics of Metal-Halide Perovskites Polished by Argon Ion Beam

Author

Hsu, Yu-Lin, Li, Chongwen, Jones, Andrew C., Pratt, Michael T., Chowdhury, Ashif, Yan, Yanfa, and Yoon, Heayoung P.

Subjects
Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

Focused ion beam (FIB) techniques have been frequently used to section metal-halide perovskites for microstructural investigations. However, the ion beams directly irradiated to the sample surface may alter the properties far different from pristine, potentially leading to modified deterioration mechanisms under aging stressors. Here, we combine complementary approaches to measure the subsurface characteristics of polished perovskite and identify the chemical species responsible for the measured properties. Analysis of the experimental results in conjunction with Monte Carlo simulations indicates that atomic displacements and local heating occur in the subsurface of methylammonium lead iodide (MAPbI3) by glazing Ar+ beam irradiation (15 nm by 4 kV at 3 degree). The lead-rich, iodine-deficient surface promotes rapid phase segregation under thermal aging conditions. On the other hand, despite the subsurface modification, our experiments confirm the rest of the MAPbI3 bulk retains the material integrity. Our observation supports that polished perovskites could serve in studying the properties of bulk or buried junctions far away from the altered subsurface with care., Comment: six figures

Published
2022
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5. Halide homogenization for low energy loss in 2-eV-bandgap perovskites and increased efficiency in all-perovskite triple-junction solar cells

Author

Wang, Junke, Zeng, Lewei, Zhang, Dong, Maxwell, Aidan, Chen, Hao, Datta, Kunal, Caiazzo, Alessandro, Remmerswaal, Willemijn H. M., Schipper, Nick R. M., Chen, Zehua, Ho, Kevin, Dasgupta, Akash, Kusch, Gunnar, Ollearo, Riccardo, Bellini, Laura, Hu, Shuaifeng, Wang, Zaiwei, Li, Chongwen, Teale, Sam, Grater, Luke, Chen, Bin, Wienk, Martijn M., Oliver, Rachel A., Snaith, Henry J., Janssen, René A. J., and Sargent, Edward H.

Published
2024
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8. Suppressed phase segregation for triple-junction perovskite solar cells

Author

Wang, Zaiwei, Zeng, Lewei, Zhu, Tong, Chen, Hao, Chen, Bin, Kubicki, Dominik J., Balvanz, Adam, Li, Chongwen, Maxwell, Aidan, Ugur, Esma, dos Reis, Roberto, Cheng, Matthew, Yang, Guang, Subedi, Biwas, Luo, Deying, Hu, Juntao, Wang, Junke, Teale, Sam, Mahesh, Suhas, Wang, Sasa, Hu, Shuangyan, Jung, Eui Dae, Wei, Mingyang, Park, So Min, Grater, Luke, Aydin, Erkan, Song, Zhaoning, Podraza, Nikolas J., Lu, Zheng-Hong, Huang, Jinsong, Dravid, Vinayak P., De Wolf, Stefaan, Yan, Yanfa, Grätzel, Michael, Kanatzidis, Merx G., and Sargent, Edward H.

Published
2023
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10. Monolithic perovskite/perovskite/silicon triple-junction solar cells with cation double displacement enabled 2.0 eV perovskites

Author

Xu, Fuzong, Aydin, Erkan, Liu, Jiang, Ugur, Esma, Harrison, George T., Xu, Lujia, Vishal, Badri, Yildirim, Bumin K., Wang, Mingcong, Ali, Roshan, Subbiah, Anand S., Yazmaciyan, Aren, Zhumagali, Shynggys, Yan, Wenbo, Gao, Yajun, Song, Zhaoning, Li, Chongwen, Fu, Sheng, Chen, Bin, ur Rehman, Atteq, Babics, Maxime, Razzaq, Arsalan, De Bastiani, Michele, Allen, Thomas G., Schwingenschlögl, Udo, Yan, Yanfa, Laquai, Frédéric, Sargent, Edward H., and De Wolf, Stefaan

Published
2024
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11. Regulating surface potential maximizes voltage in all-perovskite tandems

Author

Chen, Hao, Maxwell, Aidan, Li, Chongwen, Teale, Sam, Chen, Bin, Zhu, Tong, Ugur, Esma, Harrison, George, Grater, Luke, Wang, Junke, Wang, Zaiwei, Zeng, Lewei, Park, So Min, Chen, Lei, Serles, Peter, Awni, Rasha Abbas, Subedi, Biwas, Zheng, Xiaopeng, Xiao, Chuanxiao, Podraza, Nikolas J., Filleter, Tobin, Liu, Cheng, Yang, Yi, Luther, Joseph M., De Wolf, Stefaan, Kanatzidis, Mercouri G., Yan, Yanfa, and Sargent, Edward H.

Published
2023
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12. Publisher Correction: Regulating surface potential maximizes voltage in all-perovskite tandems

Author

Chen, Hao, Maxwell, Aidan, Li, Chongwen, Teale, Sam, Chen, Bin, Zhu, Tong, Ugur, Esma, Harrison, George, Grater, Luke, Wang, Junke, Wang, Zaiwei, Zeng, Lewei, Park, So Min, Chen, Lei, Serles, Peter, Awni, Rasha Abbas, Subedi, Biwas, Zheng, Xiaopeng, Xiao, Chuanxiao, Podraza, Nikolas J., Filleter, Tobin, Liu, Cheng, Yang, Yi, Luther, Joseph M., De Wolf, Stefaan, Kanatzidis, Mercouri G., Yan, Yanfa, and Sargent, Edward H.

Published
2023
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13. Carrier control in Sn–Pb perovskites via 2D cation engineering for all-perovskite tandem solar cells with improved efficiency and stability

Author

Tong, Jinhui, Jiang, Qi, Ferguson, Andrew J., Palmstrom, Axel F., Wang, Xiaoming, Hao, Ji, Dunfield, Sean P., Louks, Amy E., Harvey, Steven P., Li, Chongwen, Lu, Haipeng, France, Ryan M., Johnson, Samuel A., Zhang, Fei, Yang, Mengjin, Geisz, John F., McGehee, Michael D., Beard, Matthew C., Yan, Yanfa, Kuciauskas, Darius, Berry, Joseph J., and Zhu, Kai

Published
2022
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16. Indium Iodide Additive Realizing Efficient Mixed Sn─Pb Perovskite Solar Cells.

Author

Liu, Hui, Li, Chongwen, Dong, Jing, Dai, Yao, Wang, Pengyang, Shi, Biao, Zhao, Ying, and Zhang, Xiaodan

Subjects
*SOLAR cells, *PEROVSKITE, *SOLAR cell efficiency, *INDIUM, *ACTIVATION energy, *PHOTOVOLTAIC power systems
Abstract

Low‐bandgap mixed tin (Sn)‐lead (Pb) perovskite solar cells promise efficiency beyond the pure‐Pb ones. However, the difference in the interaction rate of SnI2 and PbI2 with organic salts causes spatial distribution heterogeneity of Sn2+ and Pb2+ in mixed Sn─Pb perovskite layers. This causes a Sn‐rich surface, which can trigger more severe Sn2+ oxidation and nonradiative recombination. A strategy, of introducing indium ion (In3+) into the perovskite precursor solution to compete with Sn2+ when reacting with organic salts is developed. Therefore, the nucleation and crystallization of perovskite films are well‐controlled, leading to improved film quality with a more balanced Sn/Pb ratio on the film surface. Additionally, In3+ has a lower reduction potential compared to Sn2+ which can generate an extra energy barrier for Sn2+ oxidation. The improved film quality and reduced surface oxidation result in accelerated electron transfer and reduced carrier recombination rate. The modified devices achieve a power conversion efficiency (PCE) of 23.34%, representing one of the highest PCEs in mixed Sn─Pb solar cells made with PCBM. [ABSTRACT FROM AUTHOR]

Published
2024
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18. All-Perovskite Tandems Enabled by Surface Anchoring of Long-Chain Amphiphilic Ligands

Author

Maxwell, Aidan, primary, Chen, Hao, additional, Grater, Luke, additional, Li, Chongwen, additional, Teale, Sam, additional, Wang, Junke, additional, Zeng, Lewei, additional, Wang, Zaiwei, additional, Park, So Min, additional, Vafaie, Maral, additional, Sidhik, Siraj, additional, Metcalf, Isaac W., additional, Liu, Yanjiang, additional, Mohite, Aditya D., additional, Chen, Bin, additional, and Sargent, Edward H., additional

Published
2024
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19. Dicarboxylic Acid‐Assisted Surface Oxide Removal and Passivation of Indium Antimonide Colloidal Quantum Dots for Short‐Wave Infrared Photodetectors

Author

Zhang, Yangning, primary, Xia, Pan, additional, Rehl, Benjamin, additional, Parmar, Darshan H., additional, Choi, Dongsun, additional, Imran, Muhammad, additional, Chen, Yiqing, additional, Liu, Yanjiang, additional, Vafaie, Maral, additional, Li, Chongwen, additional, Atan, Ozan, additional, Pina, Joao M., additional, Paritmongkol, Watcharaphol, additional, Levina, Larissa, additional, Voznyy, Oleksandr, additional, Hoogland, Sjoerd, additional, and Sargent, Edward Hartley, additional

Published
2024
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21. Arresting Ion Migration from The Etl Increases Stability in Infrared Light Detectors Based on Iii‐V Colloidal Quantum Dots

Author

Xia, Pan, primary, Zhu, Tong, additional, Imran, Muhammad, additional, Pina, Joao M., additional, Atan, Ozan, additional, Najarian, Amin Morteza, additional, Chen, Hao, additional, Zhang, Yangning, additional, Jung, Euidae, additional, Biondi, Margherita, additional, Vafaie, Maral, additional, Li, Chongwen, additional, Grater, Luke, additional, Khatri, Aayushi, additional, Singh, Ajay, additional, Hoogland, Sjoerd, additional, and Sargent, Edward H., additional

Published
2023
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22. Halide homogenization for low energy loss in 2-eV-bandgap perovskites and increased efficiency in all-perovskite triple-junction solar cells

Author

Wang, Junke, primary, Zeng, Lewei, additional, Zhang, Dong, additional, Maxwell, Aidan, additional, Chen, Hao, additional, Datta, Kunal, additional, Caiazzo, Alessandro, additional, Remmerswaal, Willemijn H. M., additional, Schipper, Nick R. M., additional, Chen, Zehua, additional, Ho, Kevin, additional, Dasgupta, Akash, additional, Kusch, Gunnar, additional, Ollearo, Riccardo, additional, Bellini, Laura, additional, Hu, Shuaifeng, additional, Wang, Zaiwei, additional, Li, Chongwen, additional, Teale, Sam, additional, Grater, Luke, additional, Chen, Bin, additional, Wienk, Martijn M., additional, Oliver, Rachel A., additional, Snaith, Henry J., additional, Janssen, René A. J., additional, and Sargent, Edward H., additional

Published
2023
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23. Low-bandgap mixed tin–lead iodide perovskites with reduced methylammonium for simultaneous enhancement of solar cell efficiency and stability

Author

Li, Chongwen, Song, Zhaoning, Chen, Cong, Xiao, Chuanxiao, Subedi, Biwas, Harvey, Steven P., Shrestha, Niraj, Subedi, Kamala Khanal, Chen, Lei, Liu, Dachang, Li, You, Kim, Yong-Wah, Jiang, Chun-sheng, Heben, Michael J., Zhao, Dewei, Ellingson, Randy J., Podraza, Nikolas J., Al-Jassim, Mowafak, and Yan, Yanfa

Published
2020
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24. Tailoring Crystallization Dynamics of CsPbI3 for Scalable Production of Efficient Inorganic Perovskite Solar Cells.

Author

Sun, Nannan, Fu, Sheng, Li, You, Chen, Lei, Chung, Jaehoon, Saeed, Muhammad Mohsin, Dolia, Kshitiz, Rahimi, Amirhossein, Li, Chongwen, Song, Zhaoning, and Yan, Yanfa

Subjects
SOLAR cells, PHASE transitions, CRYSTALLIZATION, SOLAR cell efficiency, PEROVSKITE, SOLVENTS
Abstract

All‐inorganic perovskite cesium lead triiodide (CsPbI3) with inorganic nature, low‐temperature synthesis, and a suitable bandgap is desirable for high‐performance photovoltaics. However, the scalable production of CsPbI3 photovoltaics is still challenging due to a large nucleation energy barrier and slow phase transition during unassisted natural crystallization. Here, the crystallization dynamics of CsPbI3 thin films is tailored via lead acetate (PbAc2) substitution in the perovskite precursor ink, allowing the scalable fabrication of efficient all‐inorganic perovskite solar cells and minimodules. Introducing PbAc2 enlarges CsPbI3 colloid size in the precursor and reduces the nucleation energy barrier. Additionally, reactions between acetate and dimethylammonium in the wet film accelerate the removal of dimethylammonium additives and generate solvent vapors for self‐regulate internal solvent annealing, resulting in densely packed, uniform, and pinhole‐free CsPbI3 perovskite films over large areas. This strategy demonstrates inverted CsPbI3 solar cells with 20.17% efficiency and good operational stability (retaining 95.5% of initial efficiency after continuous operation for 1800 h) and 15.1%‐efficient CsPbI3 minimodules with an active area of 26.8 cm2. [ABSTRACT FROM AUTHOR]

Published
2024
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26. Incorporating Potassium Citrate to Improve the Performance of Tin‐Lead Perovskite Solar Cells

Author

Chen, Lei, primary, Li, Chongwen, additional, Xian, Yeming, additional, Fu, Sheng, additional, Abudulimu, Abasi, additional, Li, Deng‐Bing, additional, Friedl, Jared D., additional, Li, You, additional, Neupane, Sabin, additional, Tumusange, Marie Solange, additional, Sun, Nannan, additional, Wang, Xiaoming, additional, Ellingson, Randy J., additional, Heben, Michael J., additional, Podraza, Nikolas J., additional, Song, Zhaoning, additional, and Yan, Yanfa, additional

Published
2023
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33. Rational design of Lewis base molecules for stable and efficient inverted perovskite solar cells

Author

Li, Chongwen, primary, Wang, Xiaoming, additional, Bi, Enbing, additional, Jiang, Fangyuan, additional, Park, So Min, additional, Li, You, additional, Chen, Lei, additional, Wang, Zaiwei, additional, Zeng, Lewei, additional, Chen, Hao, additional, Liu, Yanjiang, additional, Grice, Corey R., additional, Abudulimu, Abasi, additional, Chung, Jaehoon, additional, Xian, Yeming, additional, Zhu, Tao, additional, Lai, Huagui, additional, Chen, Bin, additional, Ellingson, Randy J., additional, Fu, Fan, additional, Ginger, David S., additional, Song, Zhaoning, additional, Sargent, Edward H., additional, and Yan, Yanfa, additional

Published
2023
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36. Regulating surface potential maximizes voltage in all-perovskite tandems

Author

Chen, Hao, primary, Maxwell, Aidan, additional, Li, Chongwen, additional, Teale, Sam, additional, Chen, Bin, additional, Zhu, Tong, additional, Ugur, Esma, additional, Harrison, George, additional, Grater, Luke, additional, Wang, Junke, additional, Wang, Zaiwei, additional, Zeng, Lewei, additional, Park, So Min, additional, Chen, Lei, additional, Serles, Peter, additional, Awni, Rasha Abbas, additional, Subedi, Biwas, additional, Zheng, Xiaopeng, additional, Xiao, Chuanxiao, additional, Podraza, Nikolas J., additional, Filleter, Tobin, additional, Liu, Cheng, additional, Yang, Yi, additional, Luther, Joseph M., additional, De Wolf, Stefaan, additional, Kanatzidis, Mercouri G., additional, Yan, Yanfa, additional, and Sargent, Edward H., additional

Published
2022
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39. Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI3)x(MAPbI3)1−x perovskite films and solar cells.

Author

Subedi, Biwas, Li, Chongwen, Junda, Maxwell M., Song, Zhaoning, Yan, Yanfa, and Podraza, Nikolas J.

Subjects
*SOLAR cells, *SILICON solar cells, *PHOTOVOLTAIC cells, *ATMOSPHERIC composition, *OPTICAL properties, *THIN films
Abstract

Narrow bandgap mixed tin (Sn) + lead (Pb) perovskites are necessary for the bottom sub-cell absorber in high efficiency all-perovskite polycrystalline tandem solar cells. We report on the impact of mixed cation composition and atmospheric exposure of perovskite films on sub-gap absorption in films and performance of solar cells based on narrow bandgap mixed formamidinium (FA) + methylammonium (MA) and Sn + Pb halide perovskites, (FASnI3)x(MAPbI3)1−x. Structural and optical properties of 0.3 ≤ x ≤ 0.8 (FASnI3)x(MAPbI3)1−x perovskite thin film absorbers with bandgaps ranging from 1.25 eV (x = 0.6) to 1.34 eV (x = 0.3) are probed with and without atmospheric exposure. Urbach energy, which quantifies the amount of sub-gap absorption, is tracked for pristine perovskite films as a function of composition, with x = 0.6 and 0.3 demonstrating the lowest and highest Urbach energies of 23 meV and 36 meV, respectively. Films with x = 0.5 and 0.6 compositions show less degradation upon atmospheric exposure than higher or lower Sn-content films having greater sub-gap absorption. The corresponding solar cells based on the x = 0.6 absorber show the highest device performance. Despite having a low Urbach energy, higher Sn-content solar cells show reduced device performances as the amount of degradation via oxidation is the most substantial. [ABSTRACT FROM AUTHOR]

Published
2020
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46. Scalable Two‐Step Production of High‐Efficiency Perovskite Solar Cells and Modules.

Author

Wu, Zhifang, Bi, Enbing, Li, Chongwen, Chen, Lei, Song, Zhaoning, and Yan, Yanfa

Abstract

Perovskite solar cells (PSCs) fabricated in laboratories have already achieved a power conversion efficiency (PCE) comparable to market‐dominant crystalline silicon solar cells. However, this promising photovoltaic technology suffers from severe loss of PCE during scaling up, limiting its progress toward commercialization. One critical question is to develop scalable, low‐cost, high throughput, and well‐controlled production methods to deposit high‐quality perovskite films. Among various approaches, two‐step sequential deposition methods have their unique advantages but have been long overlooked. This review provides an overview of two‐step methods for fabricating efficient and stable perovskite solar modules (PSMs). The mechanisms of two‐step perovskite conversion and advanced engineering approaches to modulate the perovskite formation process are discussed first. The progress of efficient PSCs prepared by different two‐step methods is surveyed and the advantages and disadvantages of each method for the scalable production of PSMs are compared. Particularly, it is highlighted that the vapor‐based two‐step methods are promising for high‐throughput in‐line production of PSMs. Finally, insights into the challenges and outlook of the industrialization of two‐step processes for producing PSMs are provided. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Preparation of a self-curable unsaturated polyester with vinyl double bonds and Investigation of its self-curing properties

Author

Li Haiyan, Zhu Fangfang, and Li Chongwen

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

In this paper, a kind of self-curable unsaturated polyester PGA-UP with vinyl groups on the end of molecule chains was synthesized through esterification reaction of glycidol with acrylic acid. The self-curable function of unsaturated polyester was put forward as a new solution to air pollution problems caused by the cross-linking monomer’s volatilization in unsaturated polyesters (UP) industry. The synthetic method, reaction process, molecular structure and self-curing properties were studied. Investigation demonstrates that the unsaturated polyester resin PGA-UP could be synthesized through a two-step process and the liquid product was a mixed outcome of different extent esterification. The unsaturated polyester resin could be self-cured through the free radical reaction of vinyl groups on the end of the molecules when they were initiated by 1% benzoyl peroxide (BPO) at 80°C for 1 hours and 120°C for 2 hours with no cross-linking monomers. The intension strength of the self-cured PGA-UP is 13.5Mpa, close to the 15.6MPa of an usual unsaturated polyester S-UP made in our lab. The self-curable PGA-UP presents good potential application and the research will contribute to improve the environmental problems caused by volatile of cross-linking monomers in unsaturated polyester applications. 1H-NMR and FT-IR were used to characterize.

Published
2017
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