Sodium formaldehyde sulfoxylate, an ionic-type, water-soluble reducing reagent to effectively improve seebeck coefficient of PEDOT:PSS film

Yemata, Temesgen Atnafu1,2,4; Zheng, Yun1; Ko Kyaw, Aung Ko1,3; Wang, Xizu1; Song, Jing1; Chin, Wee Shong2; Xu, Jianwei1,2

2020

10.1016/j.orgel.2020.105682

ORGANIC ELECTRONICS   影响因子和分区

1566-1199

1878-5530

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.
© 2020 Elsevier B.V.

Thermoelectric Sodium formaldehyde sulfoxylate PEDOT:PSS Dedoping Post-treatment Stability

EI ; SCI

英语

其他

Agency for Science, Technology and Research[] ; Shenzhen Graduate School, Peking University[]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000529350400027

Elsevier B.V.

20200908234590

Amides ; Carrier concentration ; Convergence of numerical methods ; Electric conductivity ; Formaldehyde ; Molar concentration ; Reagents ; Seebeck coefficient ; Semiconductor doping ; Sodium ; Thermal conductivity of solids

Alkali Metals:549.1 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Conducting Materials:708.2 ; Semiconducting Materials:712.1 ; Organic Compounds:804.1 ; Numerical Methods:921.6

PHYSICS

EV Compendex

1.Institute of Materials Research and Engineering, Agency for Science, Technology, and Research (A*STAR), 2 Fusionopolis Way, Singapore, 138634, Singapore
2.Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
3.Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen; 518055, China
4.Chemical Engineering Department, Bahirdar University, Bahirdar P.O. Box 26, Ethiopia

Yemata, Temesgen Atnafu,Zheng, Yun,Ko Kyaw, Aung Ko,et al. Sodium formaldehyde sulfoxylate, an ionic-type, water-soluble reducing reagent to effectively improve seebeck coefficient of PEDOT:PSS film[J]. ORGANIC ELECTRONICS,2020,81.

Yemata, Temesgen Atnafu.,Zheng, Yun.,Ko Kyaw, Aung Ko.,Wang, Xizu.,Song, Jing.,...&Xu, Jianwei.(2020).Sodium formaldehyde sulfoxylate, an ionic-type, water-soluble reducing reagent to effectively improve seebeck coefficient of PEDOT:PSS film.ORGANIC ELECTRONICS,81.

Yemata, Temesgen Atnafu,et al."Sodium formaldehyde sulfoxylate, an ionic-type, water-soluble reducing reagent to effectively improve seebeck coefficient of PEDOT:PSS film".ORGANIC ELECTRONICS 81(2020).