Fabrication of perovskite solar cells in ambient air by blocking perovskite hydration with guanabenz acetate salt

Luyao Yan, Hao Huang, Peng Cui, Shuxian Du, Zhineng Lan, Yingying Yang, Shujie Qu, Xinxin Wang, Qiang Zhang, Benyu Liu, Xiaopeng Yue, Xing Zhao, Yingfeng Li, Haifang Li, Jun Ji and Meicheng Li ()
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Luyao Yan: North China Electric Power University
Hao Huang: North China Electric Power University
Peng Cui: North China Electric Power University
Shuxian Du: North China Electric Power University
Zhineng Lan: North China Electric Power University
Yingying Yang: North China Electric Power University
Shujie Qu: North China Electric Power University
Xinxin Wang: North China Electric Power University
Qiang Zhang: North China Electric Power University
Benyu Liu: North China Electric Power University
Xiaopeng Yue: North China Electric Power University
Xing Zhao: North China Electric Power University
Yingfeng Li: North China Electric Power University
Haifang Li: North China Electric Power University
Jun Ji: North China Electric Power University
Meicheng Li: North China Electric Power University

Nature Energy, 2023, vol. 8, issue 10, 1158-1167

Abstract: Abstract The fabrication of perovskite solar cells (PSCs) in ambient air can accelerate their industrialization. However, moisture induces severe decomposition of the perovskite layer, limiting the device efficiency. Here we show that sites near vacancy defects absorb water molecules and trigger the hydration of the perovskite, eventually leading to the degradation of the material. We demonstrate that guanabenz acetate salt eliminates both cation and anion vacancies, blocking the perovskite hydration and allowing the crystallization of a high-quality film in ambient air. With guanabenz acetate salt, we prepare PSCs in ambient air with a certified efficiency of 25.08%. The PSCs without encapsulation maintain around 96% of their initial efficiency after 2,000 hours of ageing in ambient air and after 500 hours of operating at the maximum power point under simulated air mass (AM) 1.5 G solar light in a N2 atmosphere. The encapsulated devices retained 85% of their initial efficiency after 300 hours under damp heat conditions (85 °C and 85% relative humidity).

Date: 2023
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DOI: 10.1038/s41560-023-01358-w

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