Surface reconstruction of wide-bandgap perovskites enables efficient perovskite/silicon tandem solar cells

Zheng Fang, Bingru Deng, Yongbin Jin, Liu Yang, Lisha Chen, Yawen Zhong, Huiping Feng, Yue Yin, Kaikai Liu, Yingji Li, Jinyan Zhang, Jiarong Huang, Qinghua Zeng, Hao Wang, Xing Yang, Jinxin Yang, Chengbo Tian, Liqiang Xie (), Zhanhua Wei () and Xipeng Xu ()
Additional contact information
Zheng Fang: Huaqiao University
Bingru Deng: Huaqiao University
Yongbin Jin: Huaqiao University
Liu Yang: Huaqiao University
Lisha Chen: Huaqiao University
Yawen Zhong: Huaqiao University
Huiping Feng: Huaqiao University
Yue Yin: Huaqiao University
Kaikai Liu: Huaqiao University
Yingji Li: Huaqiao University
Jinyan Zhang: Gold Stone (Fujian) Energy Company Limited
Jiarong Huang: Gold Stone (Fujian) Energy Company Limited
Qinghua Zeng: Gold Stone (Fujian) Energy Company Limited
Hao Wang: Beijing Huairou Laboratory
Xing Yang: Kunshan Shengcheng Photoelectric Technology Co., Ltd.
Jinxin Yang: Huaqiao University
Chengbo Tian: Huaqiao University
Liqiang Xie: Huaqiao University
Zhanhua Wei: Huaqiao University
Xipeng Xu: Huaqiao University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Wide-bandgap perovskite solar cells (WBG-PSCs) are critical for developing perovskite/silicon tandem solar cells. The defect-rich surface of WBG-PSCs will lead to severe interfacial carrier loss and phase segregation, deteriorating the device’s performance. Herein, we develop a surface reconstruction method by removing the defect-rich crystal surface by nano-polishing and then passivating the newly exposed high-crystallinity surface. This method can refresh the perovskite/electron-transporter interface and release the residual lattice strain, improving the charge collection and inhibiting the ion migration of WBG perovskites. As a result, we can achieve certified efficiencies of 23.67% and 21.70% for opaque and semi-transparent PSCs via a 1.67-eV perovskite absorber. Moreover, we achieve four-terminal perovskite/silicon tandem solar cells with a certified efficiency of 33.10% on an aperture area of one square centimeter.

Date: 2024
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DOI: 10.1038/s41467-024-54925-4

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