Open AccessConstructing Chromium Multioxide Hole‐Selective Heterojunction for High‐Performance Perovskite Solar Cells
Author(s) -
Jiang Sheng,
Xiong Shaobing,
Dong Wei,
Li Danqin,
Yan Yuting,
Jia Menghui,
Dai Yannan,
Zhao Qingbiao,
Jiang Kai,
Liu Xianjie,
Ding Liming,
Fahlman Mats,
Sun Zhenrong,
Bao Qinye
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202203681
Subject(s) - heterojunction , materials science , perovskite (structure) , energy conversion efficiency , optoelectronics , crystallite , photovoltaic system , charge carrier , chemistry , crystallography , electrical engineering , metallurgy , engineering
Perovskite solar cells (PSCs) suffer from significant nonradiative recombination at perovskite/charge transport layer heterojunction, seriously limiting their power conversion efficiencies. Herein, solution‐processed chromium multioxide (CrO x ) is judiciously selected to construct a MAPbI 3 /CrO x /Spiro‐OMeTAD hole‐selective heterojunction. It is demonstrated that the inserted CrO x not only effectively reduces defect sites via redox shuttle at perovskite contact, but also decreases valence band maximum (VBM)‐HOMO offset between perovskite and Spiro‐OMeTAD. This will diminish thermionic losses for collecting holes and thus promote charge transport across the heterojunction, suppressing both defect‐assisted recombination and interface carrier recombination. As a result, a remarkable improvement of 21.21% efficiency with excellent device stability is achieved compared to 18.46% of the control device, which is among the highest efficiencies for polycrystalline MAPbI 3 based n–i–p planar PSCs reported to date. These findings of this work provide new insights into novel charge‐selective heterojunctions for further enhancing efficiency and stability of PSCs.