Evolution of defects during the degradation of metal halide perovskite solar cells under reverse bias and illumination

Zhenyi Ni, Haoyang Jiao, Chengbin Fei, Hangyu Gu, Shuang Xu, Zhenhua Yu, Guang Yang, Yehao Deng, Qi Jiang, Ye Liu, Yanfa Yan and Jinsong Huang ()
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Zhenyi Ni: University of North Carolina
Haoyang Jiao: University of North Carolina
Chengbin Fei: University of North Carolina
Hangyu Gu: University of North Carolina
Shuang Xu: University of North Carolina
Zhenhua Yu: University of North Carolina
Guang Yang: University of North Carolina
Yehao Deng: University of North Carolina
Qi Jiang: University of North Carolina
Ye Liu: University of North Carolina
Yanfa Yan: University of Toledo
Jinsong Huang: University of North Carolina

Nature Energy, 2022, vol. 7, issue 1, 65-73

Abstract: Abstract The efficiency and stability of perovskite solar cells are essentially determined by defects in the perovskite layer, yet their chemical nature and linking with the degradation mechanism of devices remain unclear. Here we uncover where degradation occurs and the underlying mechanisms and defects involved in the performance degradation of p–i–n perovskite solar cells under illumination or reverse bias. Light-induced degradation starts with the generation of iodide interstitials at the interfacial region between the perovskite and both charge transport layers. While we observe trap annihilation of two types of iodide defect at the anode side, we find negatively charged iodide interstitials near the cathode side, which we show to be more detrimental to the solar cell efficiency. The reverse-bias degradation is initialized by the interaction between iodide interstitials and injected holes at the interface between the electron transport layer and the perovskite. Introducing a hole-blocking layer between the layers suppresses this interaction, improving the reverse-bias stability.

Date: 2022
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DOI: 10.1038/s41560-021-00949-9

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