High-Efficiency Thermoelectrics with Functionalized Graphene
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Grossman_High-efficiency thermoelectrics.pdf
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Author(s)
Kim, Jeong Yun
Grossman, Jeffrey C.
Date Issued
April 2015
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Citation
Kim, Jeong Yun, and Jeffrey C. Grossman. “High-Efficiency Thermoelectrics with Functionalized Graphene.” Nano Lett. 15, no. 5 (May 13, 2015): 2830–2835.
Version
Author's final manuscript
Abstract
Graphene superlattices made with chemical functionalization offer the possibility of tuning both the thermal and electronic properties via nanopatterning of the graphene surface. Using classical and quantum mechanical calculations, we predict that suitable chemical functionalization of graphene can introduce peaks in the density of states at the band edge that result in a large enhancement in the Seebeck coefficient, leading to an increase in the room-temperature power factor of a factor of 2 compared to pristine graphene, despite the degraded electrical conductivity. Furthermore, the presence of patterns on graphene reduces the thermal conductivity, which when taken together leads to an increase in the figure of merit for functionalized graphene by up to 2 orders of magnitude over that of pristine graphene, reaching its maximum ZT ∼ 3 at room temperature according to our calculations. These results suggest that appropriate chemical functionalization could lead to efficient graphene-based thermoelectric materials.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/nl504257q
