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Cited by 41Thermal properties of materials2D Materials and ApplicationsAdvanced Thermoelectric Materials and Devices

Anisotropic thermal transport in van der Waals layered alloys WSe2(1-x)Te2 x

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Qian, Xin, Jiang, Puqing, Yu, Peng, Gu, Xiaokun, Liu, Zheng, Yang, Ronggui·2018·Applied Physics Letters
DOI 10.1063/1.5028258
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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.

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  • The variable spot size TDTR approach has been successfully applied to layered two-dimensional materials and bulk crystals.

    “This method has then been successfully applied in several studies of anisotropic materials including both layered two-dimensional materials (such as transition metal dichalcogenides 35 and their alloys 192 and boron nitride nanosheets 193 ) and bulk crystals (such as silicon carbide 33 ).”

    From Tutorial: Time-domain thermoreflectance (TDTR) for thermal property characterization of bulk and thin film materials (2018) · cites this paper as [192]

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Cited by

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Authors
Qian, X., Jiang, P., Yu, P., Gu, X., Liu, Z., & Yang, R.
Affiliations
  • University of Colorado Boulder (US)
  • Nanyang Technological University (SG)
  • Shanghai Jiao Tong University (CN)
ORCID
Venue
Applied Physics Letters
Publisher
AIP Publishing
Published
2018-06-11
Volume
112
Issue
24
ISSN
  • 0003-6951 (ISSN-L)
  • 1077-3118
DOI
10.1063/1.5028258
OpenAlex
W2788651039
Cited by
41
References
5
Citations by year
2026: 2 · 2025: 4 · 2024: 3 · 2023: 7 · 2022: 5 · 2021: 4 · 2020: 9 · 2019: 3 · 2018: 4
FWCI
1.87
Type
journal article
Language
en
Open access
Locations
  • Applied Physics Letters (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • DR-NTU (Nanyang Technological University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (1512776)
  • National Research Foundation Singapore (NRF-RF2013-08)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
  • Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
  • Physical Sciences › Materials Science › Materials Chemistry › Advanced Thermoelectric Materials and Devices
Keywords
anisotropic thermal conductivity, van der Waals materials, through-plane thermal conductivity, in-plane thermal conductivity, phonon transport, atomic disorder, temperature-dependent thermal conductivity, time-domain thermoreflectance

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