Intrinsic and Extrinsically Limited Thermoelectric Transport within Semiconducting Single-Walled Carbon Nanotube Networks
Abstract
Abstract Doped networks of semiconducting single‐walled carbon nanotubes (s‐SWCNTs) have recently demonstrated high thermoelectric (TE) power factors and figures of merit. Efforts to further improve the TE performance of s‐SWCNT networks hinge upon deeper understanding of the mechanisms underlying charge transport. This study explores the dependence of conductivity, thermopower, and resulting TE power factor on carrier density and temperature in s‐SWCNT networks. Careful control of charge‐carrier density illustrates a distinct transition between transport that is limited by energetic barriers between nanotube bundles to an “intrinsic” regime where these barriers are small enough to reveal the intrinsic transport mechanism of the nanotubes. Transport is activated in the s‐SWCNT networks, although a critical survey of the literature demonstrates that the activation energies in s‐SWCNT networks are appreciably smaller than typical semiconducting polymers. At high conductivity, transport behavior is consistent with deformation potential scattering. The analysis demonstrates that mitigation of the “extrinsic” limitations to transport (e.g., inter‐nanotube junctions), and the concomitant reduction of conductivity activation energies, can lead to at least a doubling of the TE power factor. Further comparison to prototypical semiconducting polymers demonstrates that this strategy likely represents a general design principle for improving the TE performance of organic materials.
- Authors:
-
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Stanford Univ., Stanford, CA (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program; USDOE
- OSTI Identifier:
- 1501658
- Alternate Identifier(s):
- OSTI ID: 1497252
- Report Number(s):
- NREL/JA-5K00-73027
Journal ID: ISSN 2199-160X
- Grant/Contract Number:
- AC36-08GO28308; DE‐AC36‐08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Electronic Materials
- Additional Journal Information:
- Journal Volume: 5; Journal Issue: 11; Journal ID: ISSN 2199-160X
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; carbon nanotubes; conductivity; organic; thermoelectric; transport
Citation Formats
Blackburn, Jeffrey L., Kang, Stephen D., Roos, Michael J., Norton-Baker, Brenna, Miller, Elisa M., and Ferguson, Andrew J. Intrinsic and Extrinsically Limited Thermoelectric Transport within Semiconducting Single-Walled Carbon Nanotube Networks. United States: N. p., 2019.
Web. doi:10.1002/aelm.201800910.
Blackburn, Jeffrey L., Kang, Stephen D., Roos, Michael J., Norton-Baker, Brenna, Miller, Elisa M., & Ferguson, Andrew J. Intrinsic and Extrinsically Limited Thermoelectric Transport within Semiconducting Single-Walled Carbon Nanotube Networks. United States. https://doi.org/10.1002/aelm.201800910
Blackburn, Jeffrey L., Kang, Stephen D., Roos, Michael J., Norton-Baker, Brenna, Miller, Elisa M., and Ferguson, Andrew J. Thu .
"Intrinsic and Extrinsically Limited Thermoelectric Transport within Semiconducting Single-Walled Carbon Nanotube Networks". United States. https://doi.org/10.1002/aelm.201800910. https://www.osti.gov/servlets/purl/1501658.
@article{osti_1501658,
title = {Intrinsic and Extrinsically Limited Thermoelectric Transport within Semiconducting Single-Walled Carbon Nanotube Networks},
author = {Blackburn, Jeffrey L. and Kang, Stephen D. and Roos, Michael J. and Norton-Baker, Brenna and Miller, Elisa M. and Ferguson, Andrew J.},
abstractNote = {Abstract Doped networks of semiconducting single‐walled carbon nanotubes (s‐SWCNTs) have recently demonstrated high thermoelectric (TE) power factors and figures of merit. Efforts to further improve the TE performance of s‐SWCNT networks hinge upon deeper understanding of the mechanisms underlying charge transport. This study explores the dependence of conductivity, thermopower, and resulting TE power factor on carrier density and temperature in s‐SWCNT networks. Careful control of charge‐carrier density illustrates a distinct transition between transport that is limited by energetic barriers between nanotube bundles to an “intrinsic” regime where these barriers are small enough to reveal the intrinsic transport mechanism of the nanotubes. Transport is activated in the s‐SWCNT networks, although a critical survey of the literature demonstrates that the activation energies in s‐SWCNT networks are appreciably smaller than typical semiconducting polymers. At high conductivity, transport behavior is consistent with deformation potential scattering. The analysis demonstrates that mitigation of the “extrinsic” limitations to transport (e.g., inter‐nanotube junctions), and the concomitant reduction of conductivity activation energies, can lead to at least a doubling of the TE power factor. Further comparison to prototypical semiconducting polymers demonstrates that this strategy likely represents a general design principle for improving the TE performance of organic materials.},
doi = {10.1002/aelm.201800910},
journal = {Advanced Electronic Materials},
number = 11,
volume = 5,
place = {United States},
year = {Thu Feb 28 00:00:00 EST 2019},
month = {Thu Feb 28 00:00:00 EST 2019}
}
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