Methylammonium Chloride as a Double-Edged Sword for Efficient and Stable Perovskite Solar Cells |
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Authors: | Bo Li Huayan Wang Aqiang Liu Yang Liu Wei Pu Ting Shen Mengjie Li Meidan Que Jianjun Tian Qilin Dai Sining Yun |
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Affiliation: | 1. College of Materials and Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi, 710055 P. R. China;2. Institute of Advanced Materials and Technology, University of Science and Technology, Beijing, 100083 P. R. China;3. Department of Materials Science and Engineering, Clemson University, Clemson, SC, 29634 USA;4. Huaneng Clean Energy Research Institute, Future SciTech Park, Beijing, 102209 P. R. China;5. Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217 USA |
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Abstract: | The additive engineering strategy promotes the efficiency of solution-processed perovskite solar cells (PSCs) over 25%. However, compositional heterogeneity and structural disorders occur in perovskite films with the addition of specific additives, making it imperative to understand the detrimental impact of additives on film quality and device performance. In this work, the double-edged sword effects of the methylammonium chloride (MACl) additive on the properties of methylammonium lead mixed-halide perovskite (MAPbI3-xClx ) films and PSCs are demonstrated. MAPbI3-xClx films suffer from undesirable morphology transition during annealing, and its impacts on the film quality including morphology, optical properties, structure, and defect evolution are systematically investigated, as well as the power conversion efficiency (PCE) evolution for related PSCs. The FAX (FA = formamidinium, X = I, Br, and Ac) post-treatment strategy is developed to inhibit the morphology transition and suppress defects by compensating for the loss of the organic components, a champion PCE of 21.49% with an impressive open-circuit voltage of 1.17 V is obtained, and remains over 95% of the initial efficiency after storing over 1200 hours. This study elucidates that understanding the additive-induced detrimental effects in halide perovskites is critical to achieve the efficient and stable PSCs. |
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Keywords: | additive engineering charge carrier recombination halide segregation perovskite solar cells stability |
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