Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.orgel.2020.105682
Title: Sodium formaldehyde sulfoxylate, an ionic-type, water-soluble reducing reagent to effectively improve seebeck coefficient of PEDOT:PSS film
Authors: Yemata, Temesgen Atnafu
Zheng, Yun
Kyaw, Aung Ko Ko
Wang, Xizu
Song, Jing
Chin, Wee Shong 
Xu, Jianwei 
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Materials Science
Physics
Thermoelectric
Sodium formaldehyde sulfoxylate
PEDOT:PSS
Dedoping
Post-treatment
Stability
ENHANCED THERMOELECTRIC PERFORMANCE
CONDUCTIVITY ENHANCEMENT
ELECTRICAL-CONDUCTIVITY
ORGANIC SEMICONDUCTOR
FORMIC-ACID
THIN-FILMS
POLY(3,4-ETHYLENEDIOXYTHIOPHENE)
TRANSPARENT
POLYANILINE
SULFONATE)
Issue Date: 1-Jun-2020
Publisher: ELSEVIER
Citation: Yemata, Temesgen Atnafu, Zheng, Yun, Kyaw, Aung Ko Ko, Wang, Xizu, Song, Jing, Chin, Wee Shong, Xu, Jianwei (2020-06-01). Sodium formaldehyde sulfoxylate, an ionic-type, water-soluble reducing reagent to effectively improve seebeck coefficient of PEDOT:PSS film. ORGANIC ELECTRONICS 81. ScholarBank@NUS Repository. https://doi.org/10.1016/j.orgel.2020.105682
Abstract: Conducting polymers such as poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) (PEDOT:PSS) have attracted extensive attention for thermoelectric applications due to its solution-processability, mechanical flexibility, low thermal conductivity and tunable electrical conductivity. This work demonstrated a sequential post-treatment method with formamide and sodium formaldehyde sulfoxylate (SFS) to significantly improve thermoelectric properties of PEDOT:PSS film, particularly its Seebeck coefficients. Water-soluble and non-toxic SFS is an ionic-type reducing agent, which is used as an environmentally benign chemical reagent for the first time to treat PEDOT:PSS. First, the PEDOT:PSS film was soaked with formamide (F-PEDOT:PSS), and then was treated with SFS solutions with various molar concentrations (SFS–F-PEDOT). The Seebeck coefficient of F-PEDOT:PSS film treated with 100 mM SFS was steeply increased from 14.8 to 51.8 μV/K primarily due to the proper control of the doping level and the carrier concentration although the corresponding electrical conductivity of the film was reduced from 2,873 to 693 S/cm. The resulting power factor reached its maximum value of 185.8 μW/K2m, which was approximately three times that of formamide-treated film (F-PEDOT:PSS: 63.7 μW/K2m). The cross-plane thermal conductivity of the pristine PEDOT:PSS film was dropped from 0.59 W/mK for the pristine film to 0.29 W/mK for the SFS-F-PEDOT:PSS film, leading to an estimated ZT value of in the range of ~0.07–~0.14 at 300 K. Also, the stability of SFS-F-PEDOT:PSS film was examined under a harsh environment, and results showed that the film retained its electrical conductivity and Seebeck coefficient of more than 85% after continuous exposure under 70 °C and a humidity of 75% RH for 480 h, revealing the excellent long-term environmental stability.
Source Title: ORGANIC ELECTRONICS
URI: https://scholarbank.nus.edu.sg/handle/10635/193120
ISSN: 15661199
18785530
DOI: 10.1016/j.orgel.2020.105682
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