期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202201663
关键词
excess PbI; (2) management; ionic liquids; perovskite solar cells
类别
资金
- Research Grants Council of Hong Kong [GRF 15221320, C7018-20G, C5037-18G]
- Shenzhen Science and Technology Innovation Commission [JCYJ 20200109105003940]
- Hong Kong Polytechnic University internal funds: Sir Szeyuen Chung Endowed Professorship Fund [8-8480]
- RISE Fund [Q-CDA5]
- PolyU Distinguished Postdoctoral Fellow Scheme [G-YWA9]
- Hong Kong Polytechnic University
- Guangdong Basic Research Foundation [2020A1515110156]
- Dalian High-level Talents Innovation Support Program [2021RQ120]
The presence of excess PbI2 in perovskite solar cells (PSCs) can boost their performance, but it also leads to instability due to the photolysis of PbI2. This study solves the issue by applying ionic liquids (ILs) on PSCs, forming stable supramolecules that can passivate the PSCs. The supramolecules improve both the power conversion efficiency and device stability.
Excess PbI2 in perovskite film is an effective strategy for boosting perovskite solar cells (PSCs) performance. However, the presence of unreacted PbI2 is a critical source of intrinsic instability in perovskite under illumination, due to the photolysis of PbI2 (decomposed into metallic lead and iodine). Herein, this issue is solved by applying ionic liquids (ILs) on PSCs where the ILs can form types of stable supramolecules with residual lead iodide. The formation process and mechanism of the supramolecules are elucidated. The residual PbI2 is also revealed to cause high level lead interstitial defects and induced tensile strain which further deteriorate device performance. The self-assembled supramolecular complex can passivate the PSCs where significant enhancements are achieved in both power conversion efficiency (PCE, from 21.9% to 23.4%) and device stability (retaining 95% of the initial PCE after 4080 h in ambient dry-air storage, and 80% after 1400 h continuous light illumination).
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