Functional Group Engineering of a Highly Doped Conjugated Polymer
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초록
내용
Conjugated polymers have been regarded as promising thermoelectric materials due to superior processibility, mechanical flexibility, and compatibility with low-power devices. However, their low electrical conductivity compared to inorganic materials limits practical applications, and the development of high-performance conjugated polymers is required. In this study, we synthesized a diketopyrrolopyrrole-based donor-acceptor copolymer having methoxy substituents with thiophene rings and investigated the substituent effect on the electrical properties and doping efficiency. The enhancement of backbone planarity and, thereby, increased electrical conductivity, which resulted from the sulfur-oxygen interaction of the functional group, is observed by AC hall measurement and density functional theory simulation methods. X-ray photoelectron spectroscopy showed that it also enables the infiltration of molecular dopants into the polymer matrix where they could not penetrate before.