Defect passivation and optical management of triple-junction solar cells.

Authors

Ye Xu, Zhijie Wang, Chen Deng, Lianlian Qi, Yi Mo, Qianqian Wang, Danni Yu, Yao Wang, Yifan Chen, Yiqin Tian, Pengcheng Zhao, Ming Luo, Dongrui Jiang, Haiyun Li, Xiaobing Ding, Rui Xia, Dongdong Yan, Pengcheng Ge, Delei Xin, Huifeng Yao, Shangqian Zhu, Kaihu Xian, Chengyue Zhou, Guangtao Yang, Li Yin, Yingguo Yang, Anurag Krishna, Wallace C H Choy, Pietro P Altermatt, Jianlu Wang, Zhigang Xie, Xueling Zhang, Junhao Chu, Hong Zhang, Jifan Gao, Yifeng Chen

Published in

Nature. Aug 17, 2026. Epub Aug 17, 2026.

Abstract

Perovskite/perovskite/silicon-based triple-junction solar cells are a promising low-cost route to surpass the Shockley-Queisser efficiency limit of single-junction photovoltaics, but their performance is constrained by non-radiative losses in wide-bandgap perovskites and sub-optimal light management across the multilayer stack^1-3. Here, we introduce a passivating molecule, 4F-POEABr, which strongly suppresses surface-defect-mediated recombination of WBG perovskite films. The ammonium attached and electron-deficient structure of 4F-POEABr provides combined chemical and field-effect passivation, enabling a quasi-Fermi-level splitting of 1.53 eV and an open-circuit voltage of 1.413 V in the WBG sub-cell. In parallel, systematic interference management is used to optimize the current density of the current-limited middle sub-cell, yielding a gain of 0.5 mA cm⁻² via a tailored tin oxide/indium zinc oxide bilayer structure. As a result, the triple-junction devices achieve certified steady-state power conversion efficiencies of 32.22% for a 1.046 cm² aperture area and 26.97% for a 15.62 cm² aperture area, with negligible hysteresis. Robust interconnection layers and engineered perovskite interfaces further enhance operational stability and reduce device-to-device variation. This work demonstrates a synergistic strategy for pushing perovskite/silicon triple-junction solar cells toward their theoretical efficiency limits, enabling scalable, high-performance photovoltaic technologies.

PMID:
42742171
Bibliographic data and abstract were imported from PubMed on 15 Sep 2026.

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