Mercapto-functionalized scaffold improves perovskite buried interfaces for tandem photovoltaics

Jianan Wang, Shuaifeng Hu, He Zhu, Sanwan Liu, Zhongyong Zhang, Rui Chen, Junke Wang, Chenyang Shi, Jiaqi Zhang, Wentao Liu, Xia Lei, Bin Liu, Yongyan Pan, Fumeng Ren, Hasan Raza, Qisen Zhou, Sibo Li, Longbin Qiu, Guanhaojie Zheng, Xiaojun Qin, Zhiguo Zhao, Shuang Yang, Neng Li, Jingbai Li, Atsushi Wakamiya, Zonghao Liu (), Henry J. Snaith () and Wei Chen ()
Additional contact information
Jianan Wang: Huazhong University of Science and Technology
Shuaifeng Hu: University of Oxford
He Zhu: Huazhong University of Science and Technology
Sanwan Liu: Huazhong University of Science and Technology
Zhongyong Zhang: Wuhan University of Technology
Rui Chen: Huazhong University of Science and Technology
Junke Wang: University of Oxford
Chenyang Shi: Huazhong University of Science and Technology
Jiaqi Zhang: Huazhong University of Science and Technology
Wentao Liu: Huazhong University of Science and Technology
Xia Lei: Southern University of Science and Technology
Bin Liu: Wuhan University of Technology
Yongyan Pan: Huazhong University of Science and Technology
Fumeng Ren: Huazhong University of Science and Technology
Hasan Raza: Huazhong University of Science and Technology
Qisen Zhou: Huazhong University of Science and Technology
Sibo Li: Southern University of Science and Technology
Longbin Qiu: Southern University of Science and Technology
Guanhaojie Zheng: Chinese Academy of Sciences
Xiaojun Qin: Huaneng Clean Energy Research Institute
Zhiguo Zhao: Huaneng Clean Energy Research Institute
Shuang Yang: East China University of Science and Technology
Neng Li: Wuhan University of Technology
Jingbai Li: Shenzhen Polytechnic University
Atsushi Wakamiya: Kyoto University
Zonghao Liu: Huazhong University of Science and Technology
Henry J. Snaith: University of Oxford
Wei Chen: Huazhong University of Science and Technology

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract Tandem photovoltaics hold great potential to surpass the efficiency limit of single-junction solar cells. Detrimental structural defects and chemical reactions at buried interfaces of subcells considerably impede the performance of integrated tandems. Here, we devise a mercapto-functionalized mesoporous silica layer as a superstructure at the buried interface to modulate the crystallisation, eliminate nanovoids, passivate defects, and suppress the oxidation of Sn(II) in the tin–lead perovskite films, contributing substantially to reduce charge carrier losses and improve stability in positive-intrinsic-negative structured devices. Consequently, the tin–lead perovskite single-junction cells show efficiency values of up to 23.7% with the best open-circuit voltage of 0.89 V. With the enhanced subcells, our double-junction tandems show efficiency values of 29.6% (certified 29.5% and steady-state 28.7%) and 24.7% on solar cells and 11.3 cm2 mini-modules, respectively. Encapsulated tandems maintain 90% of initial efficiency after 445 h of maximum power point tracking under simulated 1-sun illumination.

Date: 2025
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DOI: 10.1038/s41467-025-59891-z

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