Great Enhancement in the Seebeck Coefficient and Thermoelectric Properties of Solid PEDOT:PSS Films Through Molecular Energy Filtering by Zwitterions

Li, Chang'an1,2; Luo, Dou2; Wang, Teng2; Shan, Chengwei2; Li, Chen3; Sun, Kuan3; Kyaw, Aung Ko Ko2; Ouyang, Jianyong1

2023-07-01

10.1002/sstr.202300245

SMALL STRUCTURES   Impact Factor & Quartile

2688-4062

Organic thermoelectric (TE) materials are considered as the next-generation TE materials owing to their merits including high mechanical flexibility, low cost, abundant elements, and nontoxicity. However, their Seebeck coefficient is lower than that of the inorganic counterparts by around one order of magnitude, and thus they have a lower dimensionless figure of merit (ZT) value. Herein, the significant enhancement in the Seebeck coefficient and thus the overall TE properties of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) that is the most popular TE polymer by adding a zwitterion like rhodamine 101 (R101), N-dodecyl-N,N-dimethyl-3-ammonio-1-propane-sulfonate (DDMAP), or 1-(N,N-dimethylcarbamoyl)-4-(2-sulfoethyl) pyridinium hydroxide (DMCSP) are reported. In particular, R101 can enhance the Seebeck coefficient of the acid-then-base-treated PEDOT:PSS from 21.2 to 61.6 & mu;V K-1. The PEDOT:PSS/R101 film can exhibit a power factor of 546 & mu;W m(-1) K-2 and a ZT of 0.46 that is the highest for pure organic solid films. The enhancement in the Seebeck coefficient is ascribed to the energy filtering induced by the dipole moment of zwitterion and the & pi;-& pi; overlapping between conjugated rhodamine 101 and PEDOT:PSS. To distinguish it from the conventional methods, this method is named as the molecular energy filtering.

energy filtering PEDOT PSS rhodamine 101 Seebeck coefficients thermoelectricity zwitterions

SCI

English

Corresponding

Ministry of Education, Singapore[R-284-000-228-112] ; National Natural Science Foundation of China[62150610496] ; Shenzhen Science, Technology and Innovation Commission[JCYJ20220530113014033] ; Department of Education of Guangdong Province University Innovation Foundation[2021KTSCX107]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001038748400001

WILEY

Web of Science

1.Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117574, Singapore
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
3.Chongqing Univ, Sch Energy & Power Engn, MOE Key Lab Low Grade Energy Utilizat Technol & Sy, CQU NUS Renewable Energy Mat & Devices Joint Lab, Chongqing 400044, Peoples R China

Li, Chang'an,Luo, Dou,Wang, Teng,et al. Great Enhancement in the Seebeck Coefficient and Thermoelectric Properties of Solid PEDOT:PSS Films Through Molecular Energy Filtering by Zwitterions[J]. SMALL STRUCTURES,2023.

Li, Chang'an.,Luo, Dou.,Wang, Teng.,Shan, Chengwei.,Li, Chen.,...&Ouyang, Jianyong.(2023).Great Enhancement in the Seebeck Coefficient and Thermoelectric Properties of Solid PEDOT:PSS Films Through Molecular Energy Filtering by Zwitterions.SMALL STRUCTURES.

Li, Chang'an,et al."Great Enhancement in the Seebeck Coefficient and Thermoelectric Properties of Solid PEDOT:PSS Films Through Molecular Energy Filtering by Zwitterions".SMALL STRUCTURES (2023).