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

Yen Ting Lin, Chia Yu Lee, Chih Yao Wu, Jhih Min Lin, Tai Chou Lee, Shih Huang Tung, Cheng Liang Liu

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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 conductivity of the PEDOT-PSS film up to 1752.1 S cm−1, with an unchanged Seebeck coefficient of 15–17 μV 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 μW m−1 K−2, along with an increased conductivity of 2226.8 S cm−1 and Seebeck coefficient of 22.8 μV 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.

Original languageEnglish
Article number232516
JournalJournal of Power Sources
Volume556
DOIs
StatePublished - 1 Feb 2023

Keywords

  • Doping
  • PEDOT:PSS
  • Spray-coating
  • Thermoelectric
  • Thermoelectric generator

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