Elucidating the mechanisms underlying PCBM enhancement of CH3NH3PbI3 perovskite solar cells using GIXRD and XAFS

Bing Liu, Rongli Cui, Huan Huang, Xihong Guo, Jinquan Dong, Huanli Yao, Ying Li, Dangui Zhao, Jiahao Wang, Jing Zhang, Yu Chen, Baoyun Sun*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3145-3153
Number of pages9
JournalJournal of Materials Chemistry A
Volume8
Issue number6
DOIs
Publication statusPublished - 14 Feb 2020
Externally publishedYes

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