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Vol. 17 (2025)

Buried Interface Regulation with TbCl3 for Highly-Efficient All-Inorganic Perovskite/Silicon Tandem Solar Cells

https://doi.org/10.1007/s40820-025-01763-8
Wenming Chai
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Weidong Zhu
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
He Xi
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Dazheng Chen
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Hang Dong
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Long Zhou
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Hailong You
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Jincheng Zhang
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Chunfu Zhang
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Chunxiang Zhu
Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
Yue Hao
State Key Laboratory of Wide‑Bandgap Semiconductor Devices and Integrated Technology, School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China

Corresponding Author: Chunfu Zhang

cfzhang@xidian.edu.cn

Nano-Micro Letters, Vol. 17 (2025), Article Number: 244

Abstract

All-inorganic perovskite materials exhibit exceptional thermal stability and promising candidates for tandem devices, while their application is still in the initial stage. Here, a metal halide doping strategy was implemented to enhance device performance and stability for inverted CsPbI3 perovskite solar cells (PSCs), which are ideal for integration into perovskite/silicon tandem solar cells. The lanthanide compound terbium chloride (TbCl3) was employed to improve buried interface between [4-(3,6-Dimethyl-9H-carbazol-9-yl) butyl] phosphonic acid (Me-4PACz) and perovskite layer, thereby enhancing the crystallinity of CsPbI3 films and passivating non-radiative recombination defects. Thus, the inverted CsPbI3 PSCs achieved an efficiency of 18.68% and demonstrated excellent stability against water and oxygen. Meanwhile, remarkable efficiencies of 29.40% and 25.44% were, respectively, achieved in four-terminal (4T) and two-terminal (2T) perovskite/silicon mechanically tandem devices, which are higher efficiencies among reported all-inorganic perovskite-based tandem solar cells. This study presents a novel approach for fabricating highly efficient and stable inverted all-inorganic PSCs and perovskite/silicon tandem solar cells.


Highlights:
1 The lanthanide compound of TbCl3 improved the wettability of Me-4PACz and further enhanced crystallization, in which the additional Cl− ions passivate iodine vacancy and improve energy level alignment at buried interface.
2 The inverted CsPbI3 PSCs with TbCl3 achieved a remarkable efficiency of 18.68% and enhanced stability in ambient air.
3 Efficiencies of 29.40% and 25.44% were, respectively, achieved in 4T and 2T all-inorganic perovskite/silicon mechanically tandem devices.

Keywords

All-inorganic perovskite Tandem solar cells Interface regulation Chloride passivation
Chai, Wenming, Weidong Zhu, He Xi, Dazheng Chen, Hang Dong, Long Zhou, Hailong You, Jincheng Zhang, Chunfu Zhang, Chunxiang Zhu, and Yue Hao. 2025. “Buried Interface Regulation With TbCl3 for Highly-Efficient All-Inorganic Perovskite/Silicon Tandem Solar Cells”. Nano-Micro Letters 17 (April):244. https://doi.org/10.1007/s40820-025-01763-8.
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