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

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 reconstructio...

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Bibliographic Details
Published in:Nature communications 2024-12, Vol.15 (1), p.10554-11
Main Authors: Fang, Zheng, Deng, Bingru, Jin, Yongbin, Yang, Liu, Chen, Lisha, Zhong, Yawen, Feng, Huiping, Yin, Yue, Liu, Kaikai, Li, Yingji, Zhang, Jinyan, Huang, Jiarong, Zeng, Qinghua, Wang, Hao, Yang, Xing, Yang, Jinxin, Tian, Chengbo, Xie, Liqiang, Wei, Zhanhua, Xu, Xipeng
Format: Article
Language:English
Subjects:
147/143
147/28
639/301/299/946
639/4077/909/4101/4096
Charge efficiency
Crystal defects
Crystal lattices
Crystal surfaces
Energy gap
Humanities and Social Sciences
Ion migration
Lattice strain
multidisciplinary
Perovskites
Photovoltaic cells
Polishing
Reconstruction
Science
Science (multidisciplinary)
Silicon
Solar cells
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Summary: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. The defect-rich surface of wide-bandgap perovskite solar cells leads to severe interfacial carrier loss and phase segregation. Here, the authors reconstruct the surface through nano-polishing followed by passivation, achieving certified efficiency of 33.1% for perovskite/silicon tandem solar cells.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-54925-4