Undercoordinated Pb2+ defects passivation via tetramethoxysilane-modified for efficient and stable perovskite solar cells |
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| Affiliation: | 1. School of Advanced Materials and Nanotechnology, Xidian University, Xi''an, 710126, China;2. Key Laboratory of Solar Energy Utilization & Energy Saving Technology of Zhejiang Province, Zhejiang Energy Group R&D Institute Co., Ltd., Hangzhou, Zhejiang, 311121, China;1. School of Advanced Materials and Nanotechnology, Xidian University, Xi''an, 710126, PR China;2. School of Physics and Information Technology, Shaanxi Normal University, Xi''an, 710062, PR China;3. Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, China;1. National Engineering Research Center for Nanomedicine, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Hubei Key Laboratory of Bioinorganic Chemistry and Materia Mediea, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;1. Key Laboratory of Theoretical Organic Chemistry and Functional Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, PR China;2. College of Chemistry, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan, 411105, PR China;3. School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, 213164, PR China;1. School of Materials Science and Engineering, Shanghai University, 200444, Shanghai, China;2. Sino-European School of Technology, Shanghai University, 200444, Shanghai, China;3. School of Mechatronic Engineering and Automation, Shanghai University, 200444, Shanghai, China;4. Light, Nanomaterials, Nanotechnologies (L2n), CNRS ERL 7004, University of Technology of Troyes, F-10004, Troyes Cedex, France;5. CIMAP, Normandie Univ, ENSICAEN, UNICAEN, CEA, UMR CNRS 6252, 6 Boulevard Maréchal Juin, 14050, Caen Cedex 4, France;1. School of Chemical Engineering and Materials, Ministry of Education, Heilongjiang University, Harbin, 150080, PR China;2. School of Electronic Engineering, Ministry of Education, Heilongjiang University, Harbin, 150080, PR China;3. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, 150080, PR China;1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, PR China;4. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, PR China |
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| Abstract: | Organic-inorganic hybrid perovskite solar cells (PSCs) have developed rapidly in recent years, and the instability limits its commercialization. Non-radiative recombination caused by defects and water stability affect the device stability. Here we introduce an organic silane additive, tetramethoxysilane (TMOS), which can reduce the non-radiative recombination and prevent the water erosion. The methoxy group in TMOS can combine with Pb2+ of perovskite to passivate undercoordinated Pb2+ defects and reduce non-radiative recombination. Under a certain humidity, the hydrolyzed product SiO2 can occupy the grain boundary sites to prevent the erosion of water molecules, slow down the degradation of perovskite, and improve the crystal phase stability of perovskite. The PCE of the device increases from 17.13% to 20.12%. After 400 h at 50% relative humidity (RH), the PSC with 2% TMOS can maintain the efficiency of 90%, while the efficiency of the control group quickly dropped to only 70% of the initial. |
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| Keywords: | Perovskite solar cells TMOS Passivation Defect Stability |
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