Highly efficient all-inorganic perovskite solar cells with suppressed non-radiative recombination by a Lewis base

Jing Wang, Jie Zhang, Yingzhi Zhou, Hongbin Liu, Qifan Xue, Xiaosong Li, Chu-Chen Chueh, Hin-Lap Yip (), Zonglong Zhu () and Alex K. Y. Jen ()
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Jing Wang: City University of Hong Kong
Jie Zhang: City University of Hong Kong
Yingzhi Zhou: Institute of Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology
Hongbin Liu: University of Washington
Qifan Xue: Institute of Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology
Xiaosong Li: University of Washington
Chu-Chen Chueh: National Taiwan University
Hin-Lap Yip: Institute of Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology
Zonglong Zhu: City University of Hong Kong
Alex K. Y. Jen: City University of Hong Kong

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-019-13909-5

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