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

• 作者: Jiaji Yang Xuejing Li Yanhua Jia Jiang Zhang Qinglin Jiang
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: SPECIAL TOPIC—Organic and hybrid thermoelectrics
• 页码范围: 48-54
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/ac2487

摘要

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.