High‐Performance Ideal Bandgap Sn‐Pb Mixed Perovskite Solar Cells Achieved by MXene Passivation
Ideal bandgap (1.3-1.4 eV) Sn-Pb mixed perovskite solar cells (PSC) hold the maximum theoretical efficiency given by the Shockley-Queisser limit. However, achieving high efficiency and stable Sn-Pb mixed PSCs remains challenging. Here, piperazine-1,4-diium tetrafluoroborate (PDT) is introduced as spacer for bottom interface modification of ideal bandgap Sn-Pb mixed perovskite. This spacer enhances the quality of the upper perovskite layer and forms better energy band alignment, leading to enhanced charge extraction at the hole transport layer (HTL)/perovskite interface. Then, 2D Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene is incorporated for surface treatment of perovskite, resulting in reduced surface trap density and enhanced interfacial electron transfer. The combinations of double-sided treatment afford the ideal bandgap PSC with a high efficiency of 20.45% along with improved environment stability. This work provides a feasible guideline to prepare high-performance and stable ideal-bandgap PSCs.
Authors
- Feng Yun Yan (ORCID: https://orcid.org/0000-0001-7385-6334)
- Hok‐Leung Loi (ORCID: https://orcid.org/0000-0002-0396-4273)
- Chun‐Ki Liu (ORCID: https://orcid.org/0000-0002-4352-8652)
- Jiupeng Cao (ORCID: https://orcid.org/0000-0003-1314-0937)
- Tianyue Wang (ORCID: https://orcid.org/0000-0002-1994-9326)
- Lixian Liu (ORCID: https://orcid.org/0000-0003-4821-3542)
- Mitch Guijun Li
- Yang Xu (ORCID: https://orcid.org/0009-0000-9798-0903)
Institutions
- Hong Kong Polytechnic University (HK)
- Xidian University (CN)
- Hong Kong University of Science and Technology (HK)
- University of Hong Kong (HK)
Publication Details
- Journal
- Small
- Published
- 2024-08-15
- DOI
- https://doi.org/10.1002/smll.202403920
- Citations
- 12
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.50
Funders
- Hong Kong Polytechnic University