Journal
CHEMISTRY OF MATERIALS
Volume 34, Issue 2, Pages 736-745Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c03533
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) [19F19044, 18H03918, 20H05867, 20H05862, 20H05837, 20H05840]
- Grants-in-Aid for Scientific Research [19F19044, 20H05867, 20H05862, 20H05840, 20H05837] Funding Source: KAKEN
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This study developed crystalline pi-conjugated covalent organic frameworks (COFs) and demonstrated their potential in terms of conductivity and photoresponsivity, providing new active materials for multifunctional organic electronics.
A tunable topology and a porous network make pi-conjugated covalent organic frameworks (COFs) a new class of organic semiconductors for optoelectronic, smart sensing, and catalytic applications. Although some of the COFs exhibit enhanced electric conductivity with a high charge carrier mobility, the nature and pathways of charge transport still remain elusive. In order to unveil the transport mechanism, herein, we have developed crystalline pi-conjugated COFs using planar building blocks, and a wafer-scale self-supporting thin film was grown, which could be transferred onto any of the desired substrates. The COF film was found to be highly oriented and exhibited a high in-plane electronic conductivity. The conductivity was almost independent of temperature with an ultra-low activation energy of 14.3 meV, approaching a band-like transport of charge carriers within the crystalline domains. The COF films also showed a high photoresponsivity in electronic conduction against a complete visible range, demonstrated as a flexible photodetector device. This work represents a thorough investigation of the mechanism and direction of charge transport in crystalline pi-conjugated COF semiconductors, which suggests their feasibility as key active materials in multifunctional organic electronics.
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