DataVXAdvanced MaterialsPaper
journal article·2025-03

Activating Halogen Circulation Enables Efficient and Stable Wide‐Bandgap Mixed‐Halide Perovskite Solar Cells

Yang Yang, Qing Chang, Jie Su, Lingfeng Chao, Yonglei Wang, Zhiyuan Dai, Xiaofeng Huang, Siqing Nie, Pengfei Guo, Jun Yin, Zhe Liu, Yen‐Hung Lin, Alex K.‐Y. Jen, Ruihao Chen, Hongqiang Wang

Advanced Materials· Volume 37· Issue 11
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Source abstract

Abstract

Abstract Developing strategies to manage ion‐migration‐induced phase segregation in wide‐bandgap (WBG) perovskites is crucial for achieving high‐performance perovskite‐silicon tandem solar cells (TSCs). However, maintaining continuous suppression of phase segregation from the film crystallization process to device operation remains a significant challenge. The present study demonstrates an efficient strategy of activating halogen circulation in WBG perovskite by using halogen circulation agents (HCA) of N‐halosuccinimide molecules as the sustainable stabilizers, in order to achieve dynamic halogen equilibrium within the precursor solution and perovskite film, which blocks the migration path of Br−/I− ions both in crystallization and aging of WBG perovskites. Attempts on in situ dynamic monitoring of halide migration visually verified the enhanced stability by activated halogen circulation in both WBG films and devices. Consequently, present work achieves a champion efficiency up to 23.25% with a low Voc loss of 0.39 V in the 1.67‐eV‐bandgap device, and the HCA‐based devices can maintain 88% and 93% of their initial efficiencies over 1000 h under continuous illumination and 2500 h at 85 °C in N2 atmosphere, respectively. As a proof of concept, the perovskite/silicon monolithic TSCs are fabricated to demonstrate a high Voc of 1.99 V and a high power conversion efficiency of 33.2%.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Solid-state spectroscopy and crystallography

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering State Key Laboratory of Solidification Processing Center for Nano Energy Materials Northwestern Polytechnical University Xi'an 710072 China

Pen‐Tung Sah Institute of Micro‐Nano Science and Technology Xiamen University Xiamen 361005 China

State Key Laboratory of Wide Bandgap Semiconductor Devices and Integrated Technology Faculty of Integrated Circuit Xidian University Xi'an 710071 China

Key Laboratory of Flexible Electronics and Institute of Advanced Materials Nanjing Tech University Nanjing 211816 China

Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong 999077 China

Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Kowloon Hong Kong 999077 China

State Key Laboratory of Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and Technology Kowloon Hong Kong 999077 China

Funding

National Natural Science Foundation of China · State Key Laboratory of Solidification Processing · Shaanxi Key Science and Technology Innovation Team Project

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