Nano‐Size Effects on Decay Dynamics of Photo‐Excited Polarons in CeO2

• DOI: 10.1002/adom.202401386
• Publication Date: 2024-09-19T09:53:53Z
• Authors: Abhishek Katoch; Sang Han Park; Kwangsik Jeong; Masoud Lazemi; Ru‐Pan Wang; Hyun S. Ahn; Tae Kyu Kim; Frank M.F. de Groot; Soonnam Kwon
• Keywords: Dynamics

Abstract The study of polaron dynamics in complex materials has garnered significant attention owing to its implications for various technological applications, including catalysis, solid‐state devices, and energy storage. This paper investigates the photo‐excited electron hole cerium dioxide (CeO 2 ) using time‐resolved X‐ray absorption spectroscopy, with an emphasis on nano‐size effect. Additionally, density functional theory multiplet calculations have been utilized reveal CeO single crystal (SC) nanocrystal (NC). is observed decay into a deep trap site short duration ≈5 ps, while electrons traps stay more than 1400 ps. most observation behavior holes NC, which tends longer (≈150 ps) compared SC (<10 suggesting existence at surface bulk. fast dissociation polarons prolonged lifetime above Fermi level enhanced are proposed be among factors that influence high reactivity .