Thermoelectric (TE) energy harvesting can effectively convert waste heat into electricity,which is a crucial tech-nology 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,differ-ent 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 si-multaneously,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.

Jiaji Yang;Xuejing Li;Yanhua Jia;Jiang Zhang;Qinglin Jiang

Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China;Department of Physics,Jiangxi Science and Technology Normal University,Nanchang 330013,China

中国物理B（英文版）

[1]Jiaji Yang;Xuejing Li;Yanhua Jia;Jiang Zhang;Qinglin Jiang-.Enhanced thermoelectric performance of PEDOT:PSS films via ionic liquid post-treatment)[J].中国物理B（英文版）,2022(02):48-54

H2SO4EMIM,multaneously

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