Interfacial Thermal Contact Conductance inside the Graphene-Bi2Te3 Heterostructure
- 주제(키워드) bismuth telluride , graphene , heterostructure , optical absorption , thermal conductivity , thermal contact conductance
- 주제(기타) Chemistry, Multidisciplinary; Materials Science, Multidisciplinary
- 설명문(일반) [Cheon, Sosan; Kim, Hong Goo; Lee, Woomin; Lim, Gyumin; Lee, Woorim; Ko, Seung Hwan] Seoul Natl Univ, Dept Mech & Aerosp Engn, 1 Gwanak Ro, Seoul 08826, South Korea; [Kihm, Kenneth David] Univ Tennessee, Dept Mech Aerosp & Biomed Engn, Knoxville, TN 37996 USA; [Kim, Sung-Jin; Han, Mi-Kyung] Ewha Womans Univ, Dept Chem & Nano Sci, Seoul 03760, South Korea; [Ko, Seung Hwan] Seoul Natl Univ, Inst Adv Machinery & Design, 1 Gwanak Ro, Seoul 08826, South Korea; [Ko, Seung Hwan] Seoul Natl Univ, Inst Engn Res, 1 Gwanak Ro, Seoul 08826, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 WILEY
- 발행년도 2019
- URI http://www.dcollection.net/handler/ewha/000000159675
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/admi.201900275
초록/요약
Graphene-Bi2Te3, a graphene-based compound with a metal/metalloid heterostructure, is recently discovered to be a potentially novel thermoelectric material, demonstrating unprecedently enhanced thermoelectric efficiencies. The interfacial thermal transport must play an important role in determining the thermoelectric performance of this heterostructure. In particular, the interfacial thermal contact conductance (G(c)) must be known in order to correctly elaborate the thermoelectric performances of graphene-Bi2Te3. Furthermore, the large nonlinear optoelectric response of this heterostructure redefines both the graphene thermal conductivity (k(g)) and its optical absorbance (A(g)). A significantly suppressed A(g) is predicted as low as 0.86% from its nominal value of 2.72% when suspended, from the transfer matrix calculations based on the Fresnel principle. Both G(c) and k(g) are simultaneously determined from the optothermal Raman thermometry by duplexing the Raman data sets using two different objective magnifications (20x and 100x), which allows for the matching of the number of unknowns (G(c) and k(g)) with the corresponding two Raman data sets. The thermal properties of G(c) and k(g) for the graphene-Bi2Te3 heterostructure are first determined as 3.455 +/- 0.619 x 10(6) W m(-2) K-1 and 440.124 +/- 76.265 W m(-1) K-1, respectively.
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