Activated Corrosion and Recovery in Lead Mixed-Halide Perovskites Revealed by Dynamic Near-Ambient Pressure X-ray Photoelectron Spectroscopy.

ABSTRACT: Herein, we quantify rates of O₂-photoactivated corrosion and recovery processes within triple cation CsFAMAPb(IBr)₃ perovskite active layers using dynamic near-ambient pressure X-ray photoemission spectroscopy (NAP-XPS). Activated corrosion is described as iodide oxidation and lead reduction, which occurs only in the presence of both O₂ and light through photoinduced electron transfer. We observe electron density reorganization from the Pb-I bonds consistent with ligand exchange, evident from the nonstoichiometric redox change (i.e., <1 e^-). Approximately half of the Pb centers are reduced to weakly coordinated Pb-higher oxidation number than metallic Pb-with a rate coefficient of ∼3 (±0.3) × 10^-4 atomic percent/s. Hole capture by I

SUBMITTER: De Keersmaecker M 

PROVIDER: S-EPMC11912474 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature