Phenothiazine-based covalent organic frameworks with low exciton binding energies for photocatalysis.

ABSTRACT: Designing delocalized excitons with low binding energy (E _b) in organic semiconductors is urgently required for efficient photochemistry because the excitons in most organic materials are localized with a high E _b of >300 meV. In this work, we report the achievement of a low E _b of ∼50 meV by constructing phenothiazine-based covalent organic frameworks (COFs) with inherent crystallinity, porosity, chemical robustness, and feasibility of bandgap engineering. The low E _b facilitates effective exciton dissociation and thus promotes photocatalysis by using these COFs. As a demonstration, we subject these COFs to photocatalytic polymerization to synthesize polymers with remarkably high molecular weight without any requireme

SUBMITTER: Wang W 

PROVIDER: S-EPMC9337731 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature