Enhanced thermoelectric performance of PEDOT: PSS films via ionic liquid post-treatment

doi:10.1088/1674-1056/ac2487

Abstract Thermoelectric (TE) energy harvesting can effectively convert waste heat into electricity, which is a crucial technology to solve energy concerns. As a promising candidate for energy conversion, poly(3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) has gained significant attention owing to its easy doping, high transparency, and solution processability. However, the TE performance of PEDOT:PSS still needs to be further enhanced. Herein, different approaches have been applied for tuning the TE properties:(i) direct dipping PEDOT:PSS thin films in ionic liquid; (ii) post-treatment of the films with concentrated sulfuric acid (H₂SO₄), and then dipping in ionic liquid. Besides, the same bis(trifluoromethanesulfonyl)amide (TFSI) anion and different cation salts, including 1-ethyl-3-methylimidazolium (EMIM⁺) and lithium (Li⁺), are selected to study the influence of varying cation types on the TE properties of PEDOT:PSS. The Seebeck coefficient and electrical conductivity of the PEDOT:PSS film treated with H₂SO₄EMIM:TFSI increase simultaneously, and the resulting maximum power factor is 46.7 μW·m^-1·K^-2, which may be attributed to the ionic liquid facilitating the rearrangement of the molecular chain of PEDOT. The work provides a reference for the development of organic films with high TE properties.

Keywords: PEDOT:PSS ionic liquid thermoelectric performance

Received: 29 July 2021
Revised: 02 September 2021
Accepted manuscript online: 08 September 2021

PACS:	73.50.Lw	(Thermoelectric effects)
	78.30.cd	(Solutions and ionic liquids)
	82.35.Cd	(Conducting polymers)

Fund: Project supported by the Foundation of Guangzhou Science and Technology Project (B3210530), and the Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology, 2019-skllmd-01).

Corresponding Authors: Xuejing Li, Qinglin Jiang
E-mail: lixuejing16@163.com;jiangql@scut.edu.cn

Cite this article:

Jiaji Yang(杨家霁), Xuejing Li(李雪晶), Yanhua Jia(贾艳华), Jiang Zhang(张弜), and Qinglin Jiang(蒋庆林) Enhanced thermoelectric performance of PEDOT: PSS films via ionic liquid post-treatment 2022 Chin. Phys. B 31 027302

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Enhanced thermoelectric performance of PEDOT: PSS films via ionic liquid post-treatment

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