Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics

Polymers
Jonathan AtoyoMatthew J Carnie

Abstract

A two-step approach of improving the thermoelectric properties of Poly(3,4-ethylenedioxythiophene)poly(4-styrenesulfonate) (PEDOT:PSS) via the addition of the ionic liquid, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM:TFSI) and subsequent reduction with NaBH4 is presented. The addition of 2.5 v/v% of EMIM:TFSI to PEDOT:PSS increases the electrical conductivity from 3 S·cm-1 to 1439 S·cm-1 at 40 °C. An additional post treatment using the reducing agent, NaBH4, increases the Seebeck coefficient of the film from 11 µV·K-1 to 30 µV·K-1 at 40 °C. The combined treatment gives an overall improvement in power factor increase from 0.04 µW·m-1·K-2 to 33 µW·m-1·K-2 below 140 °C. Raman and XPS measurements show that the increase in PEDOT:PSS conductivity is due to PSS separation from PEDOT and a conformational change of the PEDOT chains from the benzoid to quinoid molecular orientation. The improved Seebeck coefficient is due to a reduction of charge carriers which is evidenced from the UV-VIS depicting the emergence of polarons.

References

Apr 23, 2013·Advanced Materials·Qingshuo WeiTakao Ishida
Jan 28, 2014·ACS Applied Materials & Interfaces·Desalegn A MengistieChih-Wei Chu
Dec 6, 2014·ACS Applied Materials & Interfaces·Desalegn A MengistieChih-Wei Chu
Aug 9, 2016·Advanced Materials·Seyoung KeeKwanghee Lee
Feb 16, 2015·Materials·Qingshuo WeiTakao Ishida
Oct 19, 2017·Scientific Reports·Hyeon Jin OhSeunghan Shin
Dec 6, 2018·Micromachines·Mario CulebrasChungyeon Cho

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Citations

Sep 2, 2021·ACS Applied Materials & Interfaces·Immanuel PaulrajChia-Jyi Liu
Sep 8, 2021·Macromolecular Rapid Communications·Anna Lena OechslePeter Müller-Buschbaum

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Methods Mentioned

BETA
chemical treatment

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