期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-13909-5
关键词
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资金
- National Science Foundation [MRI-1624430, DMR1608279, CHE-1856210]
- Office of Naval Research [N00014-17-1-2260]
- Air Force Office of Scientific Research [FA9550-18-1-0046]
- CityU start-up fund [7200587, 9610421]
- Innovation and Technology Fund [ITS/497/18FP, GHP/021/18SZ]
- Natural Science Foundation of Guangdong Province [2019A1515010761]
- STF at the University of Washington
All-inorganic perovskite solar cells (PVSCs) have drawn increasing attention because of their outstanding thermal stability. However, their performance is still inferior than the typical organic-inorganic counterparts, especially for the devices with p-i-n configuration. Herein, we successfully employ a Lewis base small molecule to passivate the inorganic perovskite film, and its derived PVSCs achieved a champion efficiency of 16.1% and a certificated efficiency of 15.6% with improved photostability, representing the most efficient inverted all-inorganic PVSCs to date. Our studies reveal that the nitrile (C-N) groups on the small molecule effectively reduce the trap density of the perovskite film and thus significantly suppresses the non-radiative recombination in the derived PVSC by passivating the Pb-exposed surface, resulting in an improved open-circuit voltage from 1.10 V to 1.16 V after passivation. This work provides an insight in the design of functional interlayers for improving efficiencies and stability of all-inorganic PVSCs.
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