Efficient Sn‐Pb Perovskite Solar Cells Through Inhibiting Hole Accumulation
Sn-Pb perovskite solar cells (PSCs) own the highest theoretical efficiency due to their ideal bandgap. However, the efficiency of Sn-Pb PSCs remains 22-23% at present, which is much lower than Pb-based PSCs. One key reason lies in the Sn<sup>2+</sup> oxidation issue. Here, this study demonstrates that apart from well-known chemical environmental oxidation, photo-generated holes and their accumulation are also a critical factor for Sn<sup>2+</sup> oxidation in Sn-Pb PSCs. To address this issue, a non-planar hole transport layer (HTL) of P3CT/Me-4PACz is designed through solution micelle regulation. P3CT/Me-4PACz will form a 3D HTL film with a spike-like structure penetrating Sn-Pb perovskite bulk to accelerate hole extraction, thus inhibiting holes accumulation and Sn<sup>2+</sup> oxidation. Resulted Sn-Pb PSCs exhibit the highest efficiency of over 24% with good operational stability, retaining 82% of initial efficiency after continuous MPP tracking for 1000 h at an elevated temperature of 55 °C.
Authors
- Qihao Weng (ORCID: https://orcid.org/0000-0002-2498-0934)
- Wenxiao Zhang (ORCID: https://orcid.org/0000-0001-7052-5011)
- Haobo Yuan (ORCID: https://orcid.org/0000-0003-0584-191X)
- Xiaodong Li (ORCID: https://orcid.org/0000-0003-0184-008X)
- Jianhong Xu
- Ting Shu (ORCID: https://orcid.org/0000-0001-9513-3719)
- Yueying Mao
- Tengyi You
- Junfeng Fang
- Yuyang Hu (ORCID: https://orcid.org/0009-0001-8649-1466)
Institutions
- East China Normal University (CN)
Publication Details
- Journal
- Advanced Materials
- Published
- 2025-05-15
- DOI
- https://doi.org/10.1002/adma.202502680
- Citations
- 10
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 7.30
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China
- National Science Fund for Distinguished Young Scholars