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Enhanced Thermoelectric Performance of As-Grown Suspended Graphene Nanoribbons.

08:00 EDT 14th August 2019 | BioPortfolio

Summary of "Enhanced Thermoelectric Performance of As-Grown Suspended Graphene Nanoribbons."

Conventionally, graphene is a poor thermoelectric material with a low figure of merit (ZT) of 10-4 to 10-3. Although nanostructuring was proposed to improve the thermoelectric performance of graphene, little experimental progress has been accomplished. Here, we carefully fabricated as-grown suspended graphene nanoribbons with quarter-micron length and ~40nm width. The ratio of electrical to thermal conductivity was enhanced by 1-2 orders of magnitude, and the Seebeck coefficient was several times larger than bulk graphene, which yielded record-high ZT values up to ~0.1. Moreover, we observed record-high electronic contribution of ~20% to the total thermal conductivity in the nanoribbon. Concurrent phonon Boltzmann transport simulations reveal that the reduction of lattice thermal conductivity is mainly attributed to quasi-ballistic phonon transport. The record-high ratio of electrical to thermal conductivity was enabled by the disparate electron and phonon mean free paths as well as the defect-free samples, and the enhanced Seebeck coefficient was attributed to the band gap opening. Our work not only demonstrates that electron and phonon transport can be fundamentally tuned and decoupled in graphene, but also indicates that graphene with appropriate nanostructures can be very promising thermoelectric materials.

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This article was published in the following journal.

Name: ACS nano
ISSN: 1936-086X
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