期刊
NANO LETTERS
卷 20, 期 8, 页码 5799-5806出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01689
关键词
perovskite solar cells; ionic liquid; interface engineering; band bending; device physics
类别
资金
- Natural Science Foundation of China [51972172, 61705102, 91833304, 61935017, 51901187]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JM-326, 2019JQ-612]
- Projects of International Cooperation and Exchanges NSFC [51811530018]
- Young 1000 Talents Global Recruitment Program of China
- Jiangsu Specially Appointed Professor program
- Six talent peaks Project in Jiangsu Province, China
- Fundamental Research Funds for the Central Universities
Electron-transport-layer free perovskite solar cells (ETL-free PSCs) have attracted great attention due to their low cost and simple manufacturing process. However, an additional interface layer has to be introduced, and the currently achieved efficiency remains far from full-structure PSCs. Here, we report an in situ interface engineering strategy by the methylammonium acetate (MAAc) ionic liquid perovskite precursor. We found that a dipole layer was in situ constructed through the physical adsorption of the residual MAAc polar molecules on the indium tin oxide electrode, which is significantly different from the treatment by the interface layer in previous reports. This allows a decrease of the effective work function and enables in situ band bending in the perovskite semiconductor. The in situ band bending facilitates charge collection and hinders interfacial charge recombination, leading to ETL-free PSCs with a maximum power conversion efficiency of 21.08%, which is the highest report to date.
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