Intrinsic and Extrinsically Limited Thermoelectric Transport within Semiconducting Single-Walled Carbon Nanotube Networks

Blackburn, Jeffrey L.; Kang, Stephen D.; Roos, Michael J.; Norton-Baker, Brenna; Miller, Elisa M.; Ferguson, Andrew J.

doi:10.1002/aelm.201800910

Title: Intrinsic and Extrinsically Limited Thermoelectric Transport within Semiconducting Single-Walled Carbon Nanotube Networks

Journal Article · Thu Feb 28 00:00:00 EST 2019 · Advanced Electronic Materials

DOI:https://doi.org/10.1002/aelm.201800910· OSTI ID:1501658

Blackburn, Jeffrey L. ^[1]; Kang, Stephen D. ^[2]; Roos, Michael J. ^[1]; Norton-Baker, Brenna ^[1]; Miller, Elisa M. ^[1]; Ferguson, Andrew J. ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
Stanford Univ., Stanford, CA (United States)

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.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program; USDOE

Grant/Contract Number:: AC36-08GO28308; DE‐AC36‐08GO28308

OSTI ID:: 1501658

Alternate ID(s):: OSTI ID: 1497252

Report Number(s):: NREL/JA-5K00-73027

Journal Information:: Advanced Electronic Materials, Vol. 5, Issue 11; ISSN 2199-160X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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