Strain regulation retards natural operation decay of perovskite solar cells

Yunxiu Shen, Tiankai Zhang, Guiying Xu, Julian A. Steele, Xiankai Chen, Weijie Chen, Guanhaojie Zheng, Jiajia Li, Boyu Guo, Heyi Yang, Yeyong Wu, Xia Lin, Thamraa Alshahrani, Wanjian Yin, Jian Zhu, Feng Wang, Aram Amassian, Xingyu Gao, Xiaohong Zhang (), Feng Gao (), Yaowen Li () and Yongfang Li
Additional contact information
Yunxiu Shen: Soochow University
Tiankai Zhang: Linköping University
Guiying Xu: Soochow University
Julian A. Steele: The University of Queensland
Xiankai Chen: Soochow University
Weijie Chen: Soochow University
Guanhaojie Zheng: Chinese Academy of Sciences
Jiajia Li: Soochow University
Boyu Guo: North Carolina State University
Heyi Yang: Soochow University
Yeyong Wu: Soochow University
Xia Lin: Soochow University
Thamraa Alshahrani: Princess Nourah bint Abdulrahman University
Wanjian Yin: Soochow University
Jian Zhu: Soochow University
Feng Wang: Linköping University
Aram Amassian: North Carolina State University
Xingyu Gao: Chinese Academy of Sciences
Xiaohong Zhang: Soochow University
Feng Gao: Linköping University
Yaowen Li: Soochow University
Yongfang Li: Soochow University

Nature, 2024, vol. 635, issue 8040, 882-889

Abstract: Abstract Perovskite solar cells (pero-SCs) have undergone rapid development in the past decade. However, there is still a lack of systematic studies investigating whether the empirical rules of working lifetime assessment used for silicon solar cells can be applied to pero-SCs. It is believed that pero-SCs show enhanced stability under day/night cycling owing to the reported self-healing effect in the dark1,2. Here we find that the degradation of highly efficient FAPbI3 pero-SCs is much faster under a natural day/night cycling mode, bringing into question the widely accepted approach to estimate the operational lifetime of pero-SCs based on continuous-mode testing. We reveal the key factor to be the lattice strain caused by thermal expansion and shrinking of the perovskite during operation, an effect that gradually relaxes under the continuous-illumination mode but cycles synchronously under the cycling mode3,4. The periodic lattice strain under the cycling mode results in deep trap accumulation and chemical degradation during operation, decreasing the ion-migration potential and hence the device lifetime5. We introduce phenylselenenyl chloride to regulate the perovskite lattice strain during day/night cycling, achieving a certified efficiency of 26.3 per cent and a 10-fold improvement in the time required to reach 80% of peak efficiency (T80) under the cycling mode after the modification.

Date: 2024
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DOI: 10.1038/s41586-024-08161-x

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