Heteroepitaxy with PbSe Nanocrystals Enables Highly Stable Wide‐Bandgap Perovskite Solar Cells
Abstract The perovskite‐based tandem solar cell is one of the promising technological pathways to achieve high efficiency. However, the mixed‐halide perovskite top cell is prone to phase segregation under continuous illumination, which leads to rapid degradation of the tandem device's overall power output. To tackle this challenge, ligand‐free lead selenide (PbSe) nanocrystals are introduced into the precursor solution to promote the heteroepitaxial growth of mixed‐halide perovskite. The incorporation of PbSe results in a high‐quality perovskite film with excellent uniformity and low defect density, effectively suppressing halide phase segregation. This improved perovskite thin film enables the fabrication of wide‐bandgap (1.68 eV) perovskite Cs 0.05 (FA 0.77 MA 0.23 ) 0.95 Pb(I 0.77 Br 0.23 ) 3 p ‐i‐ n devices, achieving a power conversion efficiency (PCE) of 22.87% and a fill factor (FF) of 84.79%. After 1000 h of maximum power point (MPP) tracking under 1‐sun continuous illumination, the perovskite solar cells retain 88% of their initial efficiency. Additionally, by mechanically stacking the semi‐transparent perovskite on copper indium gallium selenide (CIGS) solar cells, the 4‐terminal tandem cell has demonstrated a PCE of 28.24%.
Authors
- Yu Zheng (ORCID: https://orcid.org/0000-0002-1683-5577)
- Zhiyu Fang (ORCID: https://orcid.org/0000-0002-7401-4558)
- Xianghua Zhang (ORCID: https://orcid.org/0000-0002-2180-6543)
- Yi Hou (ORCID: https://orcid.org/0000-0002-1532-816X)
- Ruihao Chen (ORCID: https://orcid.org/0000-0001-8425-1234)
- Hongqiang Wang (ORCID: https://orcid.org/0000-0002-6677-7010)
- Pengfei Guo (ORCID: https://orcid.org/0000-0003-0541-4256)
- Zhen Li (ORCID: https://orcid.org/0000-0003-1177-2818)
- Weimin Li (ORCID: https://orcid.org/0000-0001-8134-2157)
- Xingchao Shao
- Chunlei Yang (ORCID: https://orcid.org/0009-0006-6052-7383)
- Xiuhai Zhang (ORCID: https://orcid.org/0000-0002-0983-8008)
- Zhe Liu (ORCID: https://orcid.org/0000-0001-7268-6214)
- Yuhui Jiang
- Liming Du
- Ning Jia (ORCID: https://orcid.org/0000-0001-9234-3374)
- Lin Fen
- Luyao Ma
Institutions
- National University of Singapore (SG)
- Northwestern Polytechnical University (CN)
- Chinese Academy of Sciences (CN)
- Yangtze River Delta Physics Research Center (China) (CN)
- Shenzhen Institutes of Advanced Technology (CN)
Publication Details
- Journal
- Advanced Energy Materials
- Published
- 2025-04-29
- DOI
- https://doi.org/10.1002/aenm.202501312
- Citations
- 5
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 3.65
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China
- Key Science and Technology Program of Shaanxi Province