Issue 4, 2020

Thermoelectric thiophene dendrimers with large Seebeck coefficients

Abstract

π-Conjugated dendrimers are emerging platforms for molecular-based photonics and electronics. Herein, we demonstrate thiophene dendrimers as new thermoelectric (TE) materials with large Seebeck coefficients through chemical charge-carrier doping, conducting film preparation, and TE transport evaluations (electrical conductivity and Seebeck coefficient). Complementary characterization with absorption, photoelectron spectroscopy, and molecular calculations reveals that the highly degenerate frontier molecular orbital energy levels derived from the highly branched and symmetric molecular structures of the dendrimers play an important role in the anomalously large Seebeck coefficients based on Mott's equation. With the recent rapid progress in the technologies for synthesizing π-conjugated dendrimers and molecular designing flexibilities, our results propose a novel strategy for exploring new TE materials.

Graphical abstract: Thermoelectric thiophene dendrimers with large Seebeck coefficients

Supplementary files

Article information

Article type
Paper
Submitted
03 Feb 2020
Accepted
31 Mar 2020
First published
02 Apr 2020

Mol. Syst. Des. Eng., 2020,5, 809-814

Author version available

Thermoelectric thiophene dendrimers with large Seebeck coefficients

K. Oki, S. Horike, M. Yamaguchi, C. Takechi, Y. Koshiba, T. Fukushima, A. Mori and K. Ishida, Mol. Syst. Des. Eng., 2020, 5, 809 DOI: 10.1039/D0ME00017E

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