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Title: Polaron delocalization dependence of the conductivity and the seebeck coefficient in doped conjugated polymers
Authors: Tam, Dexter Teck Lip
Moudgil, Akshay
Teh, Wei Jie
Wong, Marvin Zicong
Handoko, Albertus Denny
Chien, Sheau Wei
Yang, Shuo-Wang
Yeo, Boon Siang
Leong, Wei Lin
Xu, Jianwei
Keywords: Engineering::Electrical and electronic engineering::Nanoelectronics
Issue Date: 2022
Source: Tam, D. T. L., Moudgil, A., Teh, W. J., Wong, M. Z., Handoko, A. D., Chien, S. W., Yang, S., Yeo, B. S., Leong, W. L. & Xu, J. (2022). Polaron delocalization dependence of the conductivity and the seebeck coefficient in doped conjugated polymers. Journal of Physical Chemistry B, 126(9), 2073-2085.
Project: M4081866
2018-T2-1- 075
Journal: Journal of Physical Chemistry B
Abstract: Conjugated polymers are promising materials for thermoelectrics as they offer good performance at near ambient temperatures. Current focus in polymer thermoelectric research mainly targets higher power factor (a product of conductivity and square of Seebeck coefficient) through improving charge mobility. This is accomplished via structural modification in conjugated polymers, different processing techniques and dopants. As a result, structure-charge transport relationship in conjugated polymers is generally well-established. In contrast, the relationship between structure and Seebeck coefficient is poorly understood due to its complex nature. A theoretical framework by David Emin (Phys. Rev. B, 1999, 59, 6205) suggests that Seebeck coefficient can be enhanced via carrier-induced vibrational softening, whose magnitude is governed by the size of the polaron. In this work, we seek to unravel this relationship in conjugated polymers using a series of highly identical pro-quinoid polymers. These polymers are ideal to test this framework experimentally, as the quinoid character and polaron delocalization in these polymers can be well controlled even by small atomic differences (<10 atm. % per repeating unit). By increasing polaron delocalization, i.e. polaron size, we demonstrate that both conductivity and the Seebeck coefficient (and hence power factor) can be increased simultaneously, and the latter is due to the increase in the polaron’s vibrational entropy.
ISSN: 1520-6106
DOI: 10.1021/acs.jpcb.2c00303
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry B, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: embargo_20230317
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
SCBE Journal Articles

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