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Tin–lead (Sn–Pb) mixed perovskite solar cells (PSCs) are promising as bottom subcells in all-perovskite tandem solar cells, but the oxidation of Sn2+ remains challenging for long-term stability. This study reveals a compositional gradient in Sn–Pb perovskite films, where excess Sn ions accumulate at the surface, intensifying oxidation and recombination losses. To address this issue, we introduce a PbBr2-TOAB wet surface treatment strategy during the fabrication of Sn–Pb perovskite films. X-ray photoelectron spectroscopy analysis confirms that this treatment achieves more balanced Sn:Pb stoichiometry from~4.36:1 to ~2.74:1, ensuring improved film quality and resistance to Sn2+ oxidation. The treatment strategy boosts the power conversion efficiency (PCE) to
21.61% (0.09 cm2), with an independently certified (from the National Institute of Advanced Industrial Science and Technology) PCEof19.12%, compared to 21.13% for control PSCs. Moreover, target larger PSCs (1cm2) achieved an impressive PCE of 20.83%. The target PSCs show enhanced stability, retaining 80% of their initial PCE after 50 h of continuous light soaking. More importantly, encapsulated target PSCs maintain 95% of their initial PCE for 300s under continuous illumination at maximum power point tracking conditions. Time-dependent photoluminescence examination confirms that PbBr2-TOAB treatment significantly reduces ion migration, improving stability under light illumination.

権利情報:

• In Copyright
  

キーワード: Sn–Pb Perovskite Solar Cells, Stability, PbBr2 Wet Surface Treatment

刊行年月日: 2025-05-19

出版者: Wiley

掲載誌:

• Solar RRL (ISSN: 2367198X) vol. 9 issue. 12 2500225

研究助成金:

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.5947

公開URL: https://doi.org/10.1002/solr.202500225

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更新時刻: 2025-12-02 16:30:18 +0900

MDRでの公開時刻: 2025-12-02 16:29:31 +0900