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Title: Anisotropic thermal transport in van der Waals layered alloys WSe2(1-x)Te2x
Authors: Qian, Xin
Jiang, Puqing
Yu, Peng
Gu, Xiaokun
Liu, Zheng
Yang, Ronggui
Keywords: DRNTU::Engineering::Materials
Thermodynamic Processes
Issue Date: 2018
Source: Qian, X., Jiang, P., Yu, P., Gu, X., Liu, Z., & Yang, R. (2018). Anisotropic thermal transport in van der Waals layered alloys WSe2(1-x)Te2x. Applied Physics Letters, 112(24), 241901-. doi:10.1063/1.5028258
Series/Report no.: Applied Physics Letters
Abstract: Transition metal dichalcogenide (TMD) alloys have attracted great interest in recent years due to their tunable electronic properties and the semiconductor-metal phase transition along with their potential applications in solid-state memories and thermoelectrics among others. However, the thermal conductivity of layered TMD alloys remains largely unexplored despite that it plays a critical role in the reliability and functionality of TMD-enabled devices. In this work, we study the composition- and temperature-dependent anisotropic thermal conductivity of the van der Waals layered TMD alloys WSe2(1-x)Te2x in both the in-plane direction (parallel to the basal planes) and the cross-plane direction (along the c-axis) using time-domain thermoreflectance measurements. In the WSe2(1-x)Te2x alloys, the cross-plane thermal conductivity is observed to be dependent on the heating frequency (modulation frequency of the pump laser) due to the non-equilibrium transport between different phonon modes. Using a two-channel heat conduction model, we extracted the anisotropic thermal conductivity at the equilibrium limit. A clear discontinuity in both the cross-plane and the in-plane thermal conductivity is observed as x increases from 0.4 to 0.6 due to the phase transition from the 2H to the Td phase in the layered alloys. The temperature dependence of thermal conductivity for the TMD alloys was found to become weaker compared with the pristine 2H WSe2 and Td WTe2 due to the atomic disorder. This work serves as an important starting point for exploring phonon transport in layered alloys.
ISSN: 0003-6951
DOI: 10.1063/1.5028258
Rights: © 2018 The Author(s) (Published by AIP). This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of The Author(s) (Published by AIP). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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