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Wide-bandgap perovskite materials are gaining enormous attention recently, particularly in multijunction photovoltaics. Despite the encouraging development, light-induced phase segregation still impedes their operational stability, primarily due to the high content of bromide constituents. Here, we report a bilateral interface design to mitigate the phase instability of 2.1 eV bandgap all-inorganic CsPbIBr2 perovskite solar cells (PSCs)─(1) buried interface: strong chemical interactions occur between nickel oxide (NiOx) and self-assembled monolayer (SAM) via phosphonic acid anchoring groups, establishing an interfacial bridge that promotes efficient hole extraction. (2) Top surface: a solution-processed BCP (s-BCP) layer is introduced to passivate the perovskite film and suppress trap-assisted recombination, resulting in reduced phase segregation. The synergistic effect of dual interfaces reduces defect formation, moisture penetration, and phase transition, contributing to enhanced phase stability. Optimal energetic alignment and defect passivation lead to improved photovoltaic (PV) performance. As a result, the dual interface modification delivers a power conversion efficiency (PCE) of 10.2% with a fill factor of 82.3%. Additionally, the modified device retains >87% of its initial efficiency after 110 h of continuous operation and exhibits merely 5% degradation after 300 days of storage, which is one of the most stable performances reported for all-inorganic CsPbIBr2 PSCs. This work reveals a key strategy to address inherent phase instability in wide-bandgap perovskites through interface engineering.

権利情報:

• In Copyright
  This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Applied Materials & Interfaces, copyright © 2025 American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acsami.5c04349.

キーワード: Perovskite Solar Cells, CsPbIBr2, Light-Induced Phase Segregation

刊行年月日: 2025-06-11

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Applied Materials & Interfaces (ISSN: 19448252) vol. 17 issue. 23 p. 34794-34807

研究助成金:

• JST-Mirai Program JPMJMI21E6
• New Energy and Industrial Technology Development Organization 22H02190
• Chinese Government Scholarship JPMJAN23B2
• Japan Society for the Promotion of Science 22H02190

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.5950

公開URL: https://doi.org/10.1021/acsami.5c04349

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更新時刻: 2025-12-03 08:30:10 +0900

MDRでの公開時刻: 2025-12-03 08:22:52 +0900