High-Performance PEDOT:PSS Flexible Thermoelectric Materials and Their Devices by Triple Post-Treatments

Xu, Shengduo and Hong, Min and Shi, Xiao-Lei and Wang, Yuan and Ge, Lei and Bai, Yang and Wang, Lianzhou and Dargusch, Matthew and Zou, Jin and Chen, Zhi-Gang (2019) High-Performance PEDOT:PSS Flexible Thermoelectric Materials and Their Devices by Triple Post-Treatments. Chemistry of Materials , 31 (14). pp. 5238-5244. ISSN 0897-4756

Abstract

Searching an effective method to enhance the thermoelectric properties of flexible organic films can significantly widen the application of flexible thermoelectric devices. Tuning the microstacking structure and oxidation level can effectively optimize the thermoelectric properties of poly(3,4 ethylenedioxithiophene):poly(styrenesulfonate)(PEDOT:PSS) organic films. Here, we adopt triple post-treatments with formamide (CH3NO), concentrated sulfuric acid (H2SO4), and sodium borohydride in sequence to engineer flexible PEDOT:PSS thermoelectric films. A high power factor of 141 μWm−1 K−2 at 25 °C has been obtained for the PEDOT:PSS film. Such a high power factor stems from the high σ (1786 Scm−1) and S (28.1 μVK−1) after posttreatment with CH3NO, H2SO4, and NaBH4 in order. The increased carrier mobility resulting from both the selective removal of excess insulating PSS within the films and the conformation transition after CH3NO and H2SO4 treatments is responsible for the enhancement of σ, while the subsequent NaBH4 treatment optimize the electrical properties (σ and S) by modulating the oxidation level. A homemade thermoelectric device has also been fabricated using the as-prepared flexible PEDOT:PSS films and had a high output power density of ∼1 μWcm−2 with human arm as a heating source. This study indicates that flexible thermoelectric devices based on cheap conducting polymers have great potential in wearable electronics.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 22 Jan 2020 02:55
Last Modified: 29 Jan 2020 05:47
Uncontrolled Keywords: Amides; Electric power factor; Flexible electronics; Sodium Borohydride; Thermoelectric equipment; Thermoelectricity
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Funding Details:
Identification Number or DOI: 10.1021/acs.chemmater.9b01500
URI: http://eprints.usq.edu.au/id/eprint/37354

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