TY - JOUR
T1 - Elucidating the mechanisms underlying PCBM enhancement of CH3NH3PbI3 perovskite solar cells using GIXRD and XAFS
AU - Liu, Bing
AU - Cui, Rongli
AU - Huang, Huan
AU - Guo, Xihong
AU - Dong, Jinquan
AU - Yao, Huanli
AU - Li, Ying
AU - Zhao, Dangui
AU - Wang, Jiahao
AU - Zhang, Jing
AU - Chen, Yu
AU - Sun, Baoyun
N1 - Publisher Copyright:
© 2020 The Royal Society of Chemistry.
PY - 2020/2/14
Y1 - 2020/2/14
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85079482089&partnerID=8YFLogxK
U2 - 10.1039/c9ta10763k
DO - 10.1039/c9ta10763k
M3 - Article
AN - SCOPUS:85079482089
SN - 2050-7488
VL - 8
SP - 3145
EP - 3153
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 6
ER -
