[1PS-188]
우수논문발표상 응모자Nonradiative Pathway Engineering of Perovskite-Based S-Scheme Hybrids for UVC-Selective Phototransduction
발표자김상민 (전남대학교)
연구책임자윤현석 (전남대학교)
Abstract
In CsPbBr3 (CPB) nanocrystals, self-trapped exciton emission induced by PbBr6 octahedral distortion dominates excited-state relaxation, hindering charge separation under UVC excitation. Interfacing CPB with graphene enables ultrafast charge transfer, suppresses radiative recombination, and redirects excited-state relaxation into nonradiative pathways, as evidenced by reduced photoluminescence efficiency and accelerated carrier dynamics. The CPB-graphene film exhibits a pronounced UVC-selective photocurrent response. Incorporation of anatase TiO2 further constructs a CPB-graphene-TiO2 hybrid consistent with an S-scheme junction, in which low energy charge carriers recombine across the interface, while high energy electrons accumulate in TiO2 and high energy holes remain in CPB. This configuration preserves the redox driving force and effectively suppresses back recombination, leading to enhanced charge separation.