Journal
NATURE NANOTECHNOLOGY
Volume 15, Issue 11, Pages 934-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41565-020-0765-7
Keywords
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Funding
- APRC Grant of the City University of Hong Kong [9380086, 9610421]
- ECS grant from the Hong Kong Research Grants Council [21301319]
- Innovation and Technology Support Programme [ITS/497/18FP, GHP/021/18SZ]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302007]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- NSF [CBET-1159240, DMR-1506535]
- ARG grant from the City University of Hong Kong [9667168]
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Two-dimensional conjugated metal-organic frameworks used as an electron-extraction layer enable the realization of highly stable perovskite solar cells with minimized lead ion leakage. Despite the notable progress in perovskite solar cells, maintaining long-term operational stability and minimizing potentially leaked lead (Pb2+) ions are two challenges that are yet to be resolved. Here we address these issues using a thiol-functionalized 2D conjugated metal-organic framework as an electron-extraction layer at the perovskite/cathode interface. The resultant devices exhibit high power conversion efficiency (22.02%) along with a substantially improved long-term operational stability. The perovskite solar cell modified with a metal-organic framework could retain more than 90% of its initial efficiency under accelerated testing conditions, that is continuous light irradiation at maximum power point tracking for 1,000 h at 85 degrees C. More importantly, the functionalized metal-organic framework could capture most of the Pb(2+)leaked from the degraded perovskite solar cells by forming water-insoluble solids. Therefore, this method that simultaneously tackles the operational stability and lead contamination issues in perovskite solar cells could greatly improve the feasibility of large-scale deployment of perovskite photovoltaic technology.
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