Elucidating the mechanisms underlying PCBM enhancement of CH3NH3PbI3 perovskite solar cells using GIXRD and XAFS
| Autor: | Jiahao Wang, Xihong Guo, Bing Liu, Ying Li, Jinquan Dong, Baoyun Sun, Jing Zhang, Dangui Zhao, Huanli Yao, Yu Chen, Rongli Cui, Huan Huang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Synchrotron radiation 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Active layer X-ray absorption fine structure chemistry.chemical_compound chemistry Chemical engineering law General Materials Science Triiodide Crystallization 0210 nano-technology Spectroscopy Absorption (electromagnetic radiation) Perovskite (structure) |
| Zdroj: | Journal of Materials Chemistry A. 8:3145-3153 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c9ta10763k |
| Popis: | In this study, the stability mechanism of the optimized methyl ammonium lead triiodide (CH3NH3PbI3, MAPbI3)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) perovskite active layer upon exposure to moisture, light, and heating was investigated. For the first time, the existence of high-valence lead arising from PCBM is confirmed by X-ray absorption fine spectroscopy (XAFS) based on synchrotron radiation, which helps to form stronger Pb–I bonds and facilitate carrier transport. Moreover, the degree of disorder of perovskites and the [PbI6]4− octahedral distortion are significantly improved, as well as the crystallization both on the surface and in the bulk. The result of this study provides a fundamental understanding of the functions of additives with electron-withdrawing properties (e.g., PCBM) in perovskite materials and could specifically be extended to systematically design and fabricate high-efficiency and stable solar cells. |
| Databáze: | OpenAIRE |
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