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Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics.

ABSTRACT: π-conjugated backbones play a fundamental role in determining the thermoelectric (TE) properties of organic semiconductors. Understanding the relationship between the structure-property-function can help us screen valuable materials. In this study, we designed and synthesized a series of conjugated copolymers (P1, P2, and P3) based on an indacenodithiophene (IDT) building block. A copolymer (P3) with an alternating donor-acceptor (D-A) structure exhibits a narrower band gap and higher carrier mobility, which may be due to the D-A structure that helps reduce the charge carrier transport obstacles. In the end, its power factor reaches 4.91 μW m-1 K-2 at room temperature after doping, which is superior to those of non-D-A IDT-based copolymers (P1 and P2). These results indicate that moderate adjustment of the polymer backbone is an effective way to improve the TE properties of copolymers.

SUBMITTER: Liu T

PROVIDER: S-EPMC7407661 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics.

Liu Tongchao T Xie Dexun D Xu Jinjia J Pan Chengjun C

Polymers 20200630 7

π-conjugated backbones play a fundamental role in determining the thermoelectric (TE) properties of organic semiconductors. Understanding the relationship between the structure-property-function can help us screen valuable materials. In this study, we designed and synthesized a series of conjugated copolymers (P1, P2, and P3) based on an indacenodithiophene (IDT) building block. A copolymer (P3) with an alternating donor-acceptor (D-A) structure exhibits a narrower ba ...[more]

PMID: 32629831

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