journal article·2026-07

Enhancing Perovskite/Organic Tandem Solar Cell Efficiencies via Gradient‐Regulated Crystallization of Mixed‐Halide Perovskites

Jiangfeng Wang, Zonglong Song, Jiang He, Hu Shen, Shichu Peng, Jiasheng Zou, Zhixin Liu, Yintai Xu, Wenbo Peng, Peide Zhu, Deng Wang, Jie Zeng, Zhiwei Lei, Ting Xue, Yulong Lv, Yuqi Bao, Yong Zhang, Lei Yan, Kazuma Nakajima, Kenjiro Fukuda, Xingzhu Wang, Baomin Xu

Advanced Energy Materials· Volume 16· Issue 28
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Abstract

ABSTRACT Mixed‐halide wide‐bandgap (WBG) perovskites suffer from inhomogeneous crystallization and vertical halide segregation during film formation and device operation. Here, we report a gradient‐controlled crystallization strategy to regulate crystallization kinetics and halide distribution in mixed‐halide perovskite films. Enabled by selective interactions with halide species and surface‐directed accumulation, this approach establishes a surface‐to‐bulk additive concentration gradient that synchronizes halide incorporation and suppresses the formation of Br‐rich regions. The strategy alleviates compositional heterogeneity, and the resulting surface‐enriched layer further retards the penetration of moisture and oxygen. Importantly, this strategy is broadly effective for mixed‐halide compositions spanning diverse halide mixing ratios. Consequently, WBG perovskite devices deliver superior photovoltaic performance, achieving a high V OC of 1.385 V and a PCE of 17.78%. Integration of the WBG subcells into perovskite/organic tandem devices yields a champion efficiency of 25.91% with a V OC of 2.191 V, while retaining more than 80% of the initial PCE after 600 h of continuous operation.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · TiO2 Photocatalysis and Solar Cells · Organic Electronics and Photovoltaics

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

Affiliations

Department of Materials Science and Engineering and Shenzhen Engineering Research and Development Center For Flexible Solar Cells Southern University of Science and Technology Shenzhen China

Division of Electrical Electronic and Infocommunications Engineering Graduate School of Engineering The University of Osaka Osaka Japan

School of Physics and Optoelectronics Xiangtan University Xiangtan China

Engineering and Research Center For Integrated New Energy Photovoltaics & Energy Storage Systems of Hunan Province and School of Electrical Engineering University of South China Hengyang China

Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology Guangzhou China

Shenzhen Putai Technology Co., Ltd Shenzhen China

SUSTech Energy Institute For Carbon Neutrality Southern University of Science and Technology Shenzhen China

Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology) Ministry of Education Shenzhen China

Funding

National Natural Science Foundation of China · China Postdoctoral Science Foundation · Basic and Applied Basic Research Foundation of Guangdong Province

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