Dual‐Site Anchors Enabling Vertical Molecular Orientation for Efficient All‐Perovskite Tandem Solar Cells
Abstract All‐perovskite tandem solar cells (TSCs) are gaining increasing attention due to their potential to surpass the efficiency limit of single‐junction solar cells. However, as the bottom low‐bandgap subcells, tin‐lead (Sn‐Pb) perovskites suffer from severe nonradiative recombination at the interfaces due to their susceptibility to oxidation and poor crystalline morphology. Here a surface modifier 4‐(trifluoromethyl)benzhydrazide (TFH) is reported to construct a reductive chemical environment on the surface of perovskite films and protect them from water and oxygen erosion. TFH anchors onto the Sn‐Pb perovskites in a preferred vertical orientation through dual‐site binding, forming interface dipoles that facilitate charge extraction. The reductive hydrazine groups of TFH can effectively inhibit the oxidation of Sn 2+ and I − , thereby reducing the defect density and energy disorder of Sn─Pb perovskites. Consequently, the TFH‐treated devices achieved a champion PCE of 22.88%, maintaining over 93% of the initial efficiency after continuous one‐sun illumination for 500 h. Combined with a 1.79 eV wide‐bandgap subcell, it has demonstrated a PCE of 28.17% in all‐perovskite TSCs.
Authors
- Zhixin Liu (ORCID: https://orcid.org/0000-0002-0663-0826)
- X. Lei (ORCID: https://orcid.org/0009-0001-6499-2745)
- Peide Zhu (ORCID: https://orcid.org/0009-0006-1721-0970)
- Geping Qu (ORCID: https://orcid.org/0000-0002-8217-6469)
- Wenbo Peng (ORCID: https://orcid.org/0000-0003-4917-6851)
- Longbin Qiu (ORCID: https://orcid.org/0000-0002-7696-4901)
- Yintai Xu
- Baomin Xu (ORCID: https://orcid.org/0000-0002-2868-0613)
- Jiyao Zhang
- Guanshui Xie (ORCID: https://orcid.org/0000-0002-3766-0091)
- Hang Hu (ORCID: https://orcid.org/0000-0001-8141-8772)
- Yitian Bao (ORCID: https://orcid.org/0000-0002-6273-702X)
- Xingzhu Wang (ORCID: https://orcid.org/0009-0008-9709-7828)
- Yong Zhang (ORCID: https://orcid.org/0009-0008-5570-5637)
- Deng Wang (ORCID: https://orcid.org/0000-0002-7545-4504)
- Jie Zeng (ORCID: https://orcid.org/0000-0001-8596-2644)
- Lei Yan (ORCID: https://orcid.org/0000-0002-6776-2400)
Institutions
- City University of Hong Kong (HK)
- Southern University of Science and Technology (CN)
- Xiangtan University (CN)
Publication Details
- Journal
- Advanced Energy Materials
- Published
- 2024-11-13
- DOI
- https://doi.org/10.1002/aenm.202403186
- Citations
- 13
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.71
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Hunan Province
- Southern University of Science and Technology
- Shenzhen Municipal Science and Technology Innovation Council
- Shenzhen Science and Technology Innovation Program
- Basic and Applied Basic Research Foundation of Guangdong Province