Potassium Cyanate Stabilizes Lattice and Promotes Preferred Orientation for 1.67‐eV Wide‐Bandgap Perovskite and Perovskite/Silicon Tandems
Wide-bandgap (WBG) perovskite solar cells are crucial for efficient perovskite/silicon tandem solar cells (PSTSCs). However, they often suffer from uncontrolled crystallization, phase instability, and non-radiative recombination losses due to crystallographic defects. Here, we report a facile strategy of regulating perovskite crystallization and passivating uncoordinated lead ions and halide vacancies by adding potassium cyanate (KOCN) into the perovskite precursor, which incorporates into the perovskite lattice to thereby suppressing non-radiative recombination. Moreover, KOCN modulates nucleation to promote a (110) orientation and releases strain. Consequently, KOCN-based 1.67 eV-WBG perovskite devices yield a champion efficiency of 23.60% with an impressive open-circuit voltage of 1.263 V and fill factor of 84.39%, enabling a 31.10% efficiency in two-terminal PSTSCs. After 1600 h of aging in the glovebox, the KOCN-doped device retains over 98% of its initial efficiency.
Authors
- Lang Yu
- Jun Wu (ORCID: https://orcid.org/0000-0002-7444-550X)
- Sai Bai
- Sangjun Kang (ORCID: https://orcid.org/0000-0002-5096-5965)
- Shengqiang Ren (ORCID: https://orcid.org/0000-0001-5335-6324)
- L. Jiang
- Yuchao Hu (ORCID: https://orcid.org/0000-0001-5465-2491)
- Jiawen Li
- Yao Chen (ORCID: https://orcid.org/0000-0002-3715-6565)
- Shenghan Wu (ORCID: https://orcid.org/0000-0002-3843-2090)
- Jingwei Xue
- Dinghao Ma
- Chen Yin (ORCID: https://orcid.org/0000-0001-7040-958X)
- Xiaoxue Wang
- Hao Huang
- Zhicheng Song
- Dewei Zhao
- Zilong Wu
- Wenwu Wang
- Xinyu Ma
- Cong Chen
- Zhengming Ma
- Fang Yao
Institutions
- University of Electronic Science and Technology of China (CN)
- Guangxi University (CN)
- Shanxi Medical University (CN)
- Beijing Solar Energy Research Institute (CN)
- Wuhan Textile University (CN)
- Shanxi Provincial People’s Hospital (CN)
- Ministry of Energy (IL)
- China National Petroleum Corporation (China) (CN)
Publication Details
- Journal
- Advanced Materials
- Published
- 2026-01-05
- DOI
- https://doi.org/10.1002/adma.202519976
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Salt Science Research Foundation
- National Natural Science Foundation of China
- China National Petroleum Corporation
- Sichuan University
- Natural Science Foundation of Sichuan Province
- Fundamental Research Funds for the Central Universities