Linking polaron signatures to charge transport in doped thiophene polymers

Carrier doping and structural morphology are key knobs to tune thermoelectric transport in conducting polymers. Optical signatures of doping can be correlated to the thermoelectric properties of conducting polymers. In this review, we focus on absorption spectroscopy to understand thermoelectric tra...

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Main Authors: Abutaha, Anas, Chellappan, Vijila, Kumar, Pawan, Hippalgaonkar, Kedar
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/170237
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1702372023-09-04T05:35:46Z Linking polaron signatures to charge transport in doped thiophene polymers Abutaha, Anas Chellappan, Vijila Kumar, Pawan Hippalgaonkar, Kedar School of Materials Science and Engineering Engineering::Materials Charge Transport Conducting Polymers Carrier doping and structural morphology are key knobs to tune thermoelectric transport in conducting polymers. Optical signatures of doping can be correlated to the thermoelectric properties of conducting polymers. In this review, we focus on absorption spectroscopy to understand thermoelectric transport in conducting polymers. Thus, we quantitatively extract the carrier concentration from optical absorption signatures of polarons by linking the absorption ratio of the low-energy polaronic peak (P1) and neutral excitons (π-π*) in doped thiophene-based films with electrical conductivity and Seebeck coefficient using the Boltzmann transport equations (BTE). The rate of change of electrical conductivity with carrier concentration (absorption ratio) differs with variation in doping and/or processing conditions, whereas the Seebeck coefficient decreases monotonically with carrier concentration regardless of doping method as expected. The correlation confirms that charge mobility is the key parameter to improve the TE performance where the method of doping or process conditions creates a wide range of structural disorder controlling the electrical and thermoelectric properties. Agency for Science, Technology and Research (A*STAR) National Research Foundation (NRF) The authors acknowledge funding from the Accelerated Materials Development for Manufacturing Program at A*STAR via the AME Programmatic Fund by the Agency for Science, Technology and Research under Grant A1898b0043. K.H. also acknowledges funding from the NRF-CRP NRF-CRP25-2020-0002. 2023-09-04T05:35:46Z 2023-09-04T05:35:46Z 2023 Journal Article Abutaha, A., Chellappan, V., Kumar, P. & Hippalgaonkar, K. (2023). Linking polaron signatures to charge transport in doped thiophene polymers. ACS Applied Energy Materials, 6(7), 3960-3969. https://dx.doi.org/10.1021/acsaem.3c00149 2574-0962 https://hdl.handle.net/10356/170237 10.1021/acsaem.3c00149 2-s2.0-85151376434 7 6 3960 3969 en A1898b0043 NRF-CRP25-2020-0002 ACS Applied Energy Materials © 2023 American Chemical Society. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
Charge Transport
Conducting Polymers
spellingShingle Engineering::Materials
Charge Transport
Conducting Polymers
Abutaha, Anas
Chellappan, Vijila
Kumar, Pawan
Hippalgaonkar, Kedar
Linking polaron signatures to charge transport in doped thiophene polymers
description Carrier doping and structural morphology are key knobs to tune thermoelectric transport in conducting polymers. Optical signatures of doping can be correlated to the thermoelectric properties of conducting polymers. In this review, we focus on absorption spectroscopy to understand thermoelectric transport in conducting polymers. Thus, we quantitatively extract the carrier concentration from optical absorption signatures of polarons by linking the absorption ratio of the low-energy polaronic peak (P1) and neutral excitons (π-π*) in doped thiophene-based films with electrical conductivity and Seebeck coefficient using the Boltzmann transport equations (BTE). The rate of change of electrical conductivity with carrier concentration (absorption ratio) differs with variation in doping and/or processing conditions, whereas the Seebeck coefficient decreases monotonically with carrier concentration regardless of doping method as expected. The correlation confirms that charge mobility is the key parameter to improve the TE performance where the method of doping or process conditions creates a wide range of structural disorder controlling the electrical and thermoelectric properties.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Abutaha, Anas
Chellappan, Vijila
Kumar, Pawan
Hippalgaonkar, Kedar
format Article
author Abutaha, Anas
Chellappan, Vijila
Kumar, Pawan
Hippalgaonkar, Kedar
author_sort Abutaha, Anas
title Linking polaron signatures to charge transport in doped thiophene polymers
title_short Linking polaron signatures to charge transport in doped thiophene polymers
title_full Linking polaron signatures to charge transport in doped thiophene polymers
title_fullStr Linking polaron signatures to charge transport in doped thiophene polymers
title_full_unstemmed Linking polaron signatures to charge transport in doped thiophene polymers
title_sort linking polaron signatures to charge transport in doped thiophene polymers
publishDate 2023
url https://hdl.handle.net/10356/170237
_version_ 1779156357307432960