Moisture-triggered fast crystallization enables efficient and stable perovskite solar cells

Kaikai Liu, Yujie Luo, Yongbin Jin, Tianxiao Liu, Yuming Liang, Liu Yang, Peiquan Song, Zhiyong Liu, Chengbo Tian, Liqiang Xie () and Zhanhua Wei ()
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Kaikai Liu: Huaqiao University
Yujie Luo: Huaqiao University
Yongbin Jin: Huaqiao University
Tianxiao Liu: Henan Normal University
Yuming Liang: Huaqiao University
Liu Yang: Huaqiao University
Peiquan Song: Huaqiao University
Zhiyong Liu: Henan Normal University
Chengbo Tian: Huaqiao University
Liqiang Xie: Huaqiao University
Zhanhua Wei: Huaqiao University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Understanding the function of moisture on perovskite is challenging since the random environmental moisture strongly disturbs the perovskite structure. Here, we develop various N2-protected characterization techniques to comprehensively study the effect of moisture on the efficient cesium, methylammonium, and formamidinium triple-cation perovskite (Cs0.05FA0.75MA0.20)Pb(I0.96Br0.04)3. In contrast to the secondary measurements, the established air-exposure-free techniques allow us directly monitor the influence of moisture during perovskite crystallization. We find a controllable moisture treatment for the intermediate perovskite can promote the mass transportation of organic salts, and help them enter the buried bottom of the films. This process accelerates the quasi-solid-solid reaction between organic salts and PbI2, enables a spatially homogeneous intermediate phase, and translates to high-quality perovskites with much-suppressed defects. Consequently, we obtain a champion device efficiency of approaching 24% with negligible hysteresis. The devices exhibit an average T80-lifetime of 852 h (maximum 1210 h) working at the maximum power point.

Date: 2022
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DOI: 10.1038/s41467-022-32482-y

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