期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202108944
关键词
ionic liquids; multi-level distribution; one-dimension; perovskite solar cells; stability
类别
资金
- Key Laboratory of Resource Chemistry, Ministry of Education [KLRC_ME2003]
- NSFC [22025505, 51861145101, 21777096]
- Program of Shanghai Academic Technology Research Leader [20XD1422200]
- Cultivating Fund of Frontiers Science Center for Transformative Molecules [2019PT02]
The introduction of a new functional ionic liquid has improved the photovoltaic performance and long-term stability of perovskite solar cells.
The photovoltaic performance and long-term stability of perovskite solar cells (PSCs) are greatly affected by trap states. Herein, a functional ionic liquid of 1-ethyl-3-methylimidazolium trifluoroacetate (EMIMTFA) is introduced, in which the 1-ethyl-3-methylimidazolium cations (EMIM+) can interact with PbI2 to form a stable one-dimensional (1D) perovskite of EMIMPbI3, and the trifluoroacetic acid anions (TFA(-)) can passivate the interface between the electron transfer layer and the perovskite layer. Unlike, the widely studied low dimensional perovskite capping layers or quasi-2D configuration, the EMIM+ cations not only distribute on the top surface and inside the bulk phase, but also accumulate at the buried interface of 3D perovskite film, achieving a multi-level distribution. The different defect states are successfully passivated by this distribution mode, leading to a significant decrease of non-radiative recombination. As a result, the methyammonium lead iodide-based PSCs with the EMIMTFA additive show an enhanced photovoltaic performance with a champion power conversion efficiency up to 22.14% and improved long-term stability. This work demonstrates that the formation of multilevel low-dimensional structure is a new strategy for the preparation of efficient and stable PSCs.
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