Authors
Yanzhen Wu, Yihan Su, Chenyu Wang, Yixin Chen, Bo Wang
Published in
ACS applied materials & interfaces. Aug 31, 2026. Epub Aug 31, 2026.
Abstract
All-inorganic CsPbI2Br perovskite solar cells suffer from efficiency and stability losses caused by defect-mediated recombination, unfavorable interfacial energetics, and environmental degradation in carbon-based architectures. Here, we report a molecular interface engineering strategy using N-methyl-4-bromobenzylammonium chloride (4-Br-NMBACl) that enables a triple interfacial synergy addressing these limitations simultaneously. The molecular post-treatment effectively passivates undercoordinated Pb2+ defects and halide vacancies through the coordination interactions of -NH- groups and the defect-compensating effect of Cl- ions, respectively, while simultaneously optimizing interfacial energy-level alignment and enhancing moisture resistance. These synergistic effects suppress non-radiative recombination, improve charge extraction, and enhance environmental resistance. As a result, the devices deliver a power conversion efficiency (PCE) of 14.22%, compared with 12.17% for control devices, together with significantly improved operational and ambient stability. This work demonstrates a simple and effective molecular strategy for simultaneously regulating defect chemistry, interfacial energetics, and moisture resistance in all-inorganic perovskite solar cells.
PMID:
42683871
Bibliographic data and abstract were imported from PubMed on 02 Sep 2026.
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