期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 8, 页码 4238-4244出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202010987
关键词
energy levels; ionic liquids; passivation; perovskites; stability
资金
- National Natural Science Foundation of China [61975106]
- Shaanxi Technical Innovation Guidance Project [2018HJCG-17]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA17040506]
- National Key Research and Development Program of China [2016YFA0202403]
- National University Research Fund [GK261001009]
- Innovative Research Team [IRT_14R33]
- 111 Project [B14041]
- Chinese National 1000-Talents-Plan Program
- Shanxi Science and Technology Department [20201101012]
- International Institute of Biosensing (IIB) headquartered at Penn State University
In this study, DMIMPF6 ionic liquid was used to passivate surface defects of perovskite, resulting in increased solar cell efficiency and enhanced long-term stability of the device.
Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF6) ionic liquid (IL) is adopted to passivate the surface of a formamidinium-cesium lead iodide perovskite (Cs(0.08)FA(0.92)PbI(3)) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb-cluster and Pb-I antisite defects can be effectively passivated by [DMIM](+) bonding with the Pb2+ ion on the perovskite surface, leading to significantly suppressed non-radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF6-treated perovskite device demonstrated long-term stability because the hydrophobic DMIMPF6 layer blocked moisture permeation.
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