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Interfacial Engineering via Self‐Assembled Thiol Silane for High Efficiency and Stability Perovskite Solar Cells
Author(s) -
Shi Yunfan,
Zhang Huijie,
Tong Xiaolan,
Hou Xiaoyi,
Li Fangjie,
Du Yunxiao,
Wang Shaofu,
Zhang Qilin,
Liu Pei,
Zhao Xingzhong
Publication year - 2021
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202100128
Subject(s) - materials science , perovskite (structure) , passivation , energy conversion efficiency , monolayer , layer (electronics) , silane , chemical engineering , self assembled monolayer , nanotechnology , optoelectronics , composite material , engineering
Self‐assemble monolayer (SAM) has been proven to be an effective interfacial layer to improve the performance of perovskite solar cells (PSCs). Herein, a 3‐mercaptopropyltrimethoxysilane (MPTMS) SAM is used as an interlayer between the SnO 2 electron‐transporting layer (ETL) and the perovskite film to modify fully air‐processed PSCs. In the devices prepared by the two‐step method, this MPTMS SAM interlayer can slow down the crystal growth of perovskite and smooth the surface of the SnO 2 ETL, which could induce a high‐quality perovskite absorber. In contrast, it can passivate the SnO 2 /perovskite interface to enhance the extraction efficiency of photogenerated electrons and restrain carrier recombination. As a result, with suitable MPTMS SAM modification, the average power conversion efficiency (PCE) of the fully air‐processed PSCs is significantly improved from 16.62% to 18.75%, and the best device achieved a champion PCE over 20%. Moreover, the modified PSCs exhibit a good stability in ambient air. This research shows that the interface modification of MPTMS SAM is a feasible method for high‐performance PSCs.