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Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics

1
School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
2
Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
3
Weldon School of Biomedical Engineering, Birck Nanotechnology Center, Center for Implantable Devices, Purdue University, West Lafayette, IN 47907, USA
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(7), 1463; https://doi.org/10.3390/polym12071463 (registering DOI)
Received: 9 May 2020 / Revised: 26 June 2020 / Accepted: 27 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Applications of Polymers in Energy and Environmental Sciences)
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. View Full-Text
Keywords: organic thermoelectric materials; conjugated polymer; indacenodithiophene (IDT); backbone engineering organic thermoelectric materials; conjugated polymer; indacenodithiophene (IDT); backbone engineering
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MDPI and ACS Style

Liu, T.; Xie, D.; Xu, J.; Pan, C. Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics. Polymers 2020, 12, 1463.

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