Imprisoning 2H intermediate phases in blade-coated wide-bandgap perovskites for efficient all-perovskite tandem solar cells
Scalable fabrication of high-efficiency all-perovskite tandem solar cells (TSCs) remains challenging due to notable voltage deficits in wide-bandgap perovskite solar cells, primarily driven by severe halide segregation during the large-scale blade coating process. Here, we introduce 4-aminobenzylphosphonic acid as a functional "2H-imprison" additive that selectively bypasses the formation of the 2H phase (an iodine-rich structure) and promotes the direct crystallization of the desired 3C phase, resulting in a homogeneous phase and halide distribution. Consequently, blade-coated 1.77-electron volt-bandgap perovskite solar cells achieved a power conversion efficiency (PCE) of 20.35% (certified 19.72%) with an open-circuit voltage of 1.35 volts for a ~0.07-square centimeter aperture area, while 1.02-square centimeter devices delivered a PCE of 19.00%. Furthermore, the corresponding blade-coated two- and four-terminal all-perovskite TSCs demonstrated high PCEs of 27.34 and 28.46%, respectively. This study reveals the origins of phase segregation during blade coating and provides a viable strategy to mitigate it, paving the way for scalable and high-efficiency TSCs.
Authors
- Guojia Fang (ORCID: https://orcid.org/0000-0002-3880-9943)
- Dexin Pu (ORCID: https://orcid.org/0009-0001-1439-8756)
- Weiwei Meng (ORCID: https://orcid.org/0000-0002-1838-049X)
- Wenfei Shen (ORCID: https://orcid.org/0000-0001-6550-0848)
- Weijun Ke (ORCID: https://orcid.org/0000-0003-2600-5419)
- Hongling Guan (ORCID: https://orcid.org/0000-0001-6116-5536)
- Guoyi Chen (ORCID: https://orcid.org/0009-0001-1745-8275)
- Xuhao Zhang (ORCID: https://orcid.org/0000-0003-2016-4830)
- Lishuai Huang (ORCID: https://orcid.org/0009-0004-6965-3867)
- Peng Jia (ORCID: https://orcid.org/0000-0001-6623-0931)
- Jiahao Wang (ORCID: https://orcid.org/0000-0003-2957-764X)
- Guang Li (ORCID: https://orcid.org/0000-0002-4154-8553)
- Wenwen Zheng (ORCID: https://orcid.org/0000-0002-8237-7498)
- Weiqing Chen (ORCID: https://orcid.org/0000-0002-3877-0794)
- Hongyi Fang (ORCID: https://orcid.org/0009-0005-2759-3023)
- Yuan Zhou (ORCID: https://orcid.org/0009-0008-3650-3861)
Institutions
- Shenzhen University (CN)
- South China Normal University (CN)
- Wuhan University of Technology (CN)
- Wuhan University (CN)
- City University of Hong Kong, Shenzhen Research Institute (CN)
- Wuhan University of Science and Technology (CN)
- Wuhan Institute of Technology (CN)
Publication Details
- Journal
- Science Advances
- Published
- 2025-08-20
- DOI
- https://doi.org/10.1126/sciadv.ady3621
- Citations
- 11
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 8.03