Donor-acceptor conjugated copolymer with high thermoelectric performance: A case study of the oxidation process within chemical doping

doi:10.1088/1674-1056/ac3504

Abstract The doping process and thermoelectric properties of donor-acceptor (D-A) type copolymers are investigated with the representative poly([2,6'-4,8-di(5-ethylhexylthienyl)benzo[1,2-b;3,3-b] dithiophene]3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophenediyl)) (PTB7-Th). The PTB7-Th is doped by FeCl₃ and only polarons are induced in its doped films. The results reveal that the electron-rich donor units within PTB7-Th lose electrons preferentially at the initial stage of the oxidation and then the acceptor units begin to be oxidized at a high doping concentration. The energy levels of polarons and the Fermi level of the doped PTB7-Th remain almost unchange with different doping levels. However, the morphology of the PTB7-Th films could be deteriorated as the doping levels are improved, which is one of the main reasons for the decrease of electrical conductivity at the later stage of doping. The best electrical conductivity and power factor are obtained to be 42.3 S·cm^-1 and 33.9 μW·mK^-2, respectively, in the doped PTB7-Th film at room temperature. The power factor is further improved to 38.3 μW·mK^-2 at 75℃. This work may provide meaningful experience for development of D-A type thermoelectric copolymers and may further improve the doping efficiency.

Keywords: donor-acceptor copolymer doping oxidization process thermoelectric performance

Received: 22 September 2021
Revised: 25 October 2021
Accepted manuscript online: 01 November 2021

PACS:	85.30.De	(Semiconductor-device characterization, design, and modeling)
	72.80.Le	(Polymers; organic compounds (including organic semiconductors))

Fund: This work was supported by the National Key Research and Development Program of China (Grant No. Q2019YFE0107200).

Corresponding Authors: Shengqiang Xiao, Xinfeng Tang
E-mail: shengqiang@whut.edu.cn;tangxf@whut.edu.cn

Cite this article:

Liangjun Chen(陈凉君), Wei Wang(王维), Shengqiang Xiao(肖生强), and Xinfeng Tang(唐新峰) Donor-acceptor conjugated copolymer with high thermoelectric performance: A case study of the oxidation process within chemical doping 2022 Chin. Phys. B 31 028507

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Donor-acceptor conjugated copolymer with high thermoelectric performance: A case study of the oxidation process within chemical doping

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