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

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2020
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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.
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wang2020highlynature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wang, Jing;Zhang, Jie;Zhou, Yingzhi;Liu, Hongbin;Xue, Qifan;Li, Xiaosong;Chueh, Chu-Chen;Yip, Hin-Lap;Zhu, Zonglong;Jen, Alex K Y;
Journal Nature communications
Year 2020
DOI
10.1038/s41467-019-13909-5
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Keywords
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