4.8 Article

High thermoelectric performance of spray-coated Poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) films enabled by two-step post-treatment process

Journal

JOURNAL OF POWER SOURCES
Volume 556, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jpowsour.2022.232516

Keywords

Thermoelectric; Spray-coating; Doping; Thermoelectric generator; PEDOT; PSS

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In this study, poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) films with improved thermoelectric properties were fabricated using spray coating and a sequential two-step post-treatment process. The electrical conductivity of the PEDOT-PSS film was greatly increased up to 1752.1 S cm-1 through EG treatment, while the use of 0.05 M MAI in the second step provided a high power factor of 122.3 mu Wm-1 K-2. The fabrication approach developed in this study provides a paradigm for producing polymer thermoelectric materials with great potential for application in wearable thermoelectric devices.
Herein, poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) films with improved thermoelectric properties are fabricated via spray coating followed by a sequential, two-step post-treatment process with ethylene glycol (EG) and a methylammonium iodide (MAI) solution. The EG treatment greatly increases the electrical con-ductivity of the PEDOT-PSS film up to 1752.1 S cm -1, with an unchanged Seebeck coefficient of 15-17 mu V K- 1, while the optimal use of 0.05 M MAI in DMSO/DI water for the second step provides a high power factor of 122.3 mu Wm- 1 K- 2, along with an increased conductivity of 2226.8 S cm -1 and Seebeck coefficient of 22.8 mu V K- 1. Notably, the obtained power factor is among the highest reported for spray-coated polymer-based thermoelectric devices. The performance enhancement is attributed to phase separation of the non-conductive PSS from the PEDOT, the change in chain conformation, the preferential orientation of the PEDOT crystallites, and the manipulation of energy levels. High thermoelectric performance of the as-fabricated PEDOT:PSS on a plastic substrate is established by using a facile proof-of-concept thermoelectric generator to generate a maximum power density of 12.1 nW cm-2. The fabrication approach developed herein provides an essential paradigm for the production of polymer thermoelectric materials with great potential for application in wearable thermoelectric devices.

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