1. Constructing Chromium Multioxide Hole-Selective Heterojunction for High-Performance Perovskite Solar Cells
- Author
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Sheng Jiang, Shaobing Xiong, Wei Dong, Danqin Li, Yuting Yan, Menghui Jia, Yannan Dai, Qingbiao Zhao, Kai Jiang, Xianjie Liu, Liming Ding, Mats Fahlman, Zhenrong Sun, and Qinye Bao
- Subjects
Other Chemical Engineering ,charge transport ,efficiency ,hole-selective heterojunction ,nonradiative recombination ,perovskite solar cells ,General Chemical Engineering ,General Engineering ,General Physics and Astronomy ,Medicine (miscellaneous) ,General Materials Science ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,Annan kemiteknik - Abstract
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 (CrOx) is judiciously selected to construct a MAPbI(3)/CrOx/Spiro-OMeTAD hole-selective heterojunction. It is demonstrated that the inserted CrOx 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. Funding Agencies|National Science Foundation of China [21875067]; Shanghai Science and Technology Innovation Action Plan [22ZR1418900]; Fundamental Research Funds for the Central Universities; Shanghai Rising-Star [19QA1403100]; East China Normal University (ECNU) Multifunctional Platform for Innovation; open research fund of Songshan Lake Materials Laboratory [2021SLABFK02]; National Key Research and Development Program of China [2017YFA0206600]; National Natural Science Foundation of China [51922032, 21961160720]
- Published
- 2022