Initializing film homogeneity to retard phase segregation for stable perovskite solar cells

The mixtures of cations and anions used in hybrid halide perovskites for high-performance solar cells often undergo element and phase segregation, which limits device lifetime. We adapted Schelling's model of segregation to study individual cation migration and found that the initial film inhom...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2022-11, Vol.378 (6621), p.747-754
Main Authors: Bai, Yang, Huang, Zijian, Zhang, Xiao, Lu, Jiuzhou, Niu, Xiuxiu, He, Ziwen, Zhu, Cheng, Xiao, Mengqi, Song, Qizhen, Wei, Xueyuan, Wang, Chenyue, Cui, Zhenhua, Dou, Jing, Chen, Yihua, Pei, Fengtao, Zai, Huachao, Wang, Wei, Song, Tinglu, An, Pengfei, Zhang, Jing, Dong, Juncai, Li, Yiming, Shi, Jiangjian, Jin, Haibo, Chen, Pengwan, Sun, Yuchao, Li, Yujing, Chen, Haining, Wei, Zhongming, Zhou, Huanping, Chen, Qi
Format: Article
Language:English
Subjects:
Anions
Cations
Cesium
Colloiding
Homogeneity
Iodides
Mixtures
Performance degradation
Perovskites
Photovoltaic cells
Solar cells
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Summary:The mixtures of cations and anions used in hybrid halide perovskites for high-performance solar cells often undergo element and phase segregation, which limits device lifetime. We adapted Schelling's model of segregation to study individual cation migration and found that the initial film inhomogeneity accelerates materials degradation. We fabricated perovskite films (FA Cs PbI ; where FA is formamidinium) through the addition of selenophene, which led to homogeneous cation distribution that retarded cation aggregation during materials processing and device operation. The resultant devices achieved enhanced efficiency and retained >91% of their initial efficiency after 3190 hours at the maximum power point under 1 sun illumination. We also observe prolonged operational lifetime in devices with initially homogeneous FACsPb(Br I ) absorbers.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.abn3148