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Efficient and Stable Chemical Passivation on Perovskite Surface via Bidentate Anchoring
Author(s) -
Zhang Hao,
Wu Yongzhen,
Shen Chao,
Li Erpeng,
Yan Chenxu,
Zhang Weiwei,
Tian He,
Han Liyuan,
Zhu WeiHong
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201803573
Subject(s) - passivation , materials science , perovskite (structure) , energy conversion efficiency , relative humidity , open circuit voltage , chlorobenzene , photoluminescence , grain boundary , denticity , chemical engineering , layer (electronics) , nanotechnology , optoelectronics , catalysis , composite material , voltage , metallurgy , organic chemistry , chemistry , metal , engineering , physics , microstructure , quantum mechanics , thermodynamics
Chemical passivation is an effective approach to suppress the grain surface dominated charge recombination in perovskite solar cells (PSCs). However, the passivation effect is usually labile on perovskite crystal surface since most passivating agents are weakly anchored. Here, the use of a bidentate molecule, 2‐mercaptopyridine (2‐MP), to increase anchoring strength for improving the passivation efficacy and stability synchronously is demonstrated. Compared to monodentate counterparts of pyridine and p ‐toluenethiol, 2‐MP passivation on CH 3 NH 3 PbI 3 film results in twofold improvement of photoluminescence lifetime and remarkably enhanced tolerance to chlorobenzene washing and vacuum heating, which improve the power conversion efficiency of n–i–p planar structured PSCs from 18.35% to 20.28%, with open‐circuit voltage approaching 1.18 V. Moreover, the CH 3 NH 3 PbI 3 films passivated with 2‐MP exhibit unprecedented humid‐stability that they can be exposed to saturated humidity for at least 5 h, mainly due to the passivation induced surface deactivation, which renders the unencapsulated devices retaining 93% of the initial efficiency after 60 days aging in air with relative humidity of 60–70%.