Issue 29, 2022

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

Abstract

Designing delocalized excitons with low binding energy (Eb) in organic semiconductors is urgently required for efficient photochemistry because the excitons in most organic materials are localized with a high Eb of >300 meV. In this work, we report the achievement of a low Eb of ∼50 meV by constructing phenothiazine-based covalent organic frameworks (COFs) with inherent crystallinity, porosity, chemical robustness, and feasibility of bandgap engineering. The low Eb 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 requirement of the metal catalyst. Our results can facilitate the rational design of porous materials with low Eb for efficient photocatalysis.

Graphical abstract: Phenothiazine-based covalent organic frameworks with low exciton binding energies for photocatalysis

Supplementary files

Article information

Article type
Edge Article
Submitted
05 may 2022
Accepted
05 iyl 2022
First published
09 iyl 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022,13, 8679-8685

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

W. Wang, H. Wang, X. Tang, J. Huo, Y. Su, C. Lu, Y. Zhang, H. Xu and C. Gu, Chem. Sci., 2022, 13, 8679 DOI: 10.1039/D2SC02503E

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