journal article·2026-04-10

Synergistic Ion Engineering for Wide-Bandgap Perovskite Enables Perovskite–Organic Tandem Solar Cells with a Record Certified Voltage

Xinyu Li, Yuanyuan Liu, Yu-ang Liu, Dehan Li, Yudong Zuo, Shantao Zhang, Yuchen Li, Rongyao Lv, Yuan Li, Guoqing Tong, Tao Chen, Zhengguo Xiao, Xiao Cheng Zeng, Junfa Zhu, Shuang Chen, Zhimin Fang, Guan-Wu Wang, Zonglong Zhu, Shangfeng Yang

ACS Energy Letters· Volume 11· Issue 4
Publisher page

Abstract

Mixed-halide wide-bandgap (WBG) perovskites suffer from defect-induced open-circuit voltage ( V OC ) loss and photoinduced phase segregation. Herein, we introduce rubidium formate (RbFa) as a single dopant to mitigate both challenges through synergistic ion engineering. The Rb + cation enters the lattice to induce contraction, while the formate anion (Fa – ) modulates crystallization kinetics and passivates halide vacancies. This cooperative interaction maximizes residual compressive strain, thermodynamically raising the ion-migration barrier, while vacancy passivation kinetically blocks migration pathways. Consequently, we achieve a high V OC of 1.371 V and enhanced photostability for 1.86 eV WBG perovskite solar cells (PSCs). Monolithic perovskite–organic tandem solar cells deliver an efficiency of 26.03% with a record certified V OC of 2.189 V and retain over 90% of their initial efficiency after 1000 h under continuous 1-sun illumination.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Organic Electronics and Photovoltaics · Thin-Film Transistor Technologies

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

Affiliations

State Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), School of Chemistry and Materials Science

University of Science and Technology of China

Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, and School of Chemistry and Materials Science

Anhui Normal University

Kuang Yaming Honors School

Nanjing University

School of Materials Science and Engineering

Hefei University of Technology

National Synchrotron Radiation Laboratory

Department of Materials Science and Engineering

City University of Hong Kong

Institute of Technology for Carbon Neutralization, Interdisciplinary Research Center for Advanced Energy

Yangzhou University

Department of Chemistry

Funding

Science and Technology Planning Project of Guangdong Province · Research Grants Council, University Grants Committee · Natural Science Research of Jiangsu Higher Education Institutions of China · Natural Science Foundation of Jiangsu Province · Innovation and Technology Fund · Science, Technology and Innovation Commission of Shenzhen Municipality · City University of Hong Kong · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Chinese Academy of Sciences · Yangzhou City

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