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Korean Journal of Metals and Materials > Volume 56(2); 2018 > Article
Korean Journal of Metals and Materials 2018;56(2): 163-169. doi: https://doi.org/10.3365/KJMM.2018.56.2.163
환원 산화 그래핀을 이용한 계면제어가 다결정 SnSe의 열전 수송특성에 미치는 효과
이상태, 임영수
부경대학교 신소재시스템공학과
Effects of Interface Control Using Reduced Graphene Oxide (RGO) on the Thermoelectric Transport Properties of Polycrystalline SnSe Compounds
Sang Tae Lee, Young Soo Lim
Department of Materials Syetem Engineering, Pukyong National University, Busan 48547, Republic of Korea
Correspondence  Young Soo Lim ,Tel: +82-51-629-6384, Email: yslim@pknu.ac.kr
Received: 18 October 2017;  Accepted: 6 November 2017.  Published online: 5 February 2018.
ABSTRACT
We report the effects of interface control using reduced graphene oxide (RGO) on the thermoelectric transport properties of polycrystalline SnSe compounds. Polycrystalline SnSe-RGO composites were prepared by the consolidation of SnSe powder coated with the RGO by hot pressing, and the RGO content was controlled to be 0, 0.2, 0.5 and 1 wt%. The incorporation of RGO did not induce any structural changes in the crystal structure of SnSe, and no additional secondary phase could be observed. The electrical conductivity of the composites increased with increasing RGO content. This increase was largely the result of increased hole concentration due to the hole Fermi liquid phenomenon at the SnSe-RGO interface, and it was elucidated by the reduced Seebeck coefficient with increasing RGO content. However, this tendency could only be clearly observed at relatively low temperatures, and the incorporation of the RGO did not lead to a significant increase in the power factor. The thermal conductivity of the composites decreased with the increase in RGO content, and revealed that there was additional phonon scattering at the grain boundary interfaces due to the existence of the RGO. These results, demonstrated that independent control of charge and thermal transport, i.e., phonon glass-electron crystal, could be realized by interface control using RGO in polycrystalline SnSe compounds.
Keywords: thermoelectric, SnSe, reduced graphene oxide, hot pressing, interface control
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