Flexible all-perovskite tandem solar cells approaching 25% efficiency with molecule-bridged hole-selective contact

Ludong Li, Yurui Wang, Xiaoyu Wang, Renxing Lin, Xin Luo, Zhou Liu, Kun Zhou, Shaobing Xiong, Qinye Bao, Gang Chen, Yuxi Tian, Yu Deng, Ke Xiao, Jinlong Wu, Makhsud I. Saidaminov, Hongzhen Lin, Chang-Qi Ma, Zhisheng Zhao, Yingju Wu, Lijun Zhang () and Hairen Tan ()
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Ludong Li: Nanjing University
Yurui Wang: Nanjing University
Xiaoyu Wang: Jilin University
Renxing Lin: Nanjing University
Xin Luo: Nanjing University
Zhou Liu: Nanjing University
Kun Zhou: Jilin University
Shaobing Xiong: East China Normal University
Qinye Bao: East China Normal University
Gang Chen: ShanghaiTech University
Yuxi Tian: Nanjing University
Yu Deng: Nanjing University
Ke Xiao: Nanjing University
Jinlong Wu: Nanjing University
Makhsud I. Saidaminov: University of Victoria
Hongzhen Lin: Chinese Academy of Sciences
Chang-Qi Ma: Chinese Academy of Sciences
Zhisheng Zhao: Yanshan University
Yingju Wu: Yanshan University
Lijun Zhang: Jilin University
Hairen Tan: Nanjing University

Nature Energy, 2022, vol. 7, issue 8, 708-717

Abstract: Abstract Lightweight flexible perovskite solar cells are promising for building integrated photovoltaics, wearable electronics, portable energy systems and aerospace applications. However, their highest certified efficiency of 19.9% lags behind their rigid counterparts (highest 25.7%), mainly due to defective interfaces at charge-selective contacts with perovskites on top. Here we use a mixture of two hole-selective molecules based on carbazole cores and phosphonic acid anchoring groups to form a self-assembled monolayer and bridge perovskite with a low temperature-processed NiO nanocrystal film. The hole-selective contact mitigates interfacial recombination and facilitates hole extraction. We show flexible all-perovskite tandem solar cells with an efficiency of 24.7% (certified 24.4%), outperforming all types of flexible thin-film solar cell. We also report 23.5% efficiency for larger device areas of 1.05 cm2. The molecule-bridged interfaces enable significant bending durability of flexible all-perovskite tandem solar cells that retain their initial performance after 10,000 cycles of bending at a radius of 15 mm.

Date: 2022
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DOI: 10.1038/s41560-022-01045-2

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