skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The role of mid-gap phonon modes in thermal transport of transition metal dichalcogenides

Journal Article · · Journal of Physics. Condensed Matter

We present a comprehensive theoretical study on thermal transport in monolayer transition metal dichalcogenides MX2 (M: Mo, W; X: S, Se) with various sample sizes. An unusually high anharmonic scattering strength is found in MoSe2 compared to the other three family members, which arises from its unique phonon band dispersion, specifically the mid-frequency phonon branches associated with the vibrations of Se atoms of MoSe2. The mid-frequency modes almost completely span the gap that exists between the high-frequency phonon branches and the acoustic ones, allowing the former to readily decay into the latter. The resultant high anharmonic scattering gives rise to a short mean free path which makes the room temperature in-plane thermal conductivity in MoSe2 even lower than WSe2 when the sample length is larger than 51.5 nm. With varying sample sizes, the ordering of thermal conductivity among the four materials changes as phonon transport transits from the ballistic to diffusive regime, driven by the competition between the phonon frequency spectrum range and the scattering strength. In conclusion, our work provides a microscopic picture of phonon transport in TMDs and guidance to tailor their thermal conductivities for electronic and thermoelectric applications.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1571848
Journal Information:
Journal of Physics. Condensed Matter, Vol. 32, Issue 2; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

References (37)

Measurement of Lateral and Interfacial Thermal Conductivity of Single- and Bilayer MoS 2 and MoSe 2 Using Refined Optothermal Raman Technique journal November 2015
Thermal Conductivity of Monolayer Molybdenum Disulfide Obtained from Temperature-Dependent Raman Spectroscopy journal December 2013
ShengBTE: A solver of the Boltzmann transport equation for phonons journal June 2014
Measurement of the anisotropic thermal conductivity of molybdenum disulfide by the time-resolved magneto-optic Kerr effect journal December 2014
Phonons and related crystal properties from density-functional perturbation theory journal July 2001
Quantum thermal transport in nanostructures journal April 2008
Role of crystal structure and junction morphology on interface thermal conductance journal October 2015
A Revisit to High Thermoelectric Performance of Single-layer MoS2 journal December 2015
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal September 2009
Phonon transport in single-layer transition metal dichalcogenides: A first-principles study journal September 2014
Electrons and Phonons book January 2001
Thermal conductivity of bulk and monolayer MoS 2 journal February 2016
Ab initio study of the effect of vacancies on the thermal conductivity of boron arsenide journal July 2016
First-Principles Determination of Ultrahigh Thermal Conductivity of Boron Arsenide: A Competitor for Diamond? journal July 2013
Thermal Conductivity of Monolayer MoSe 2 and MoS 2 journal November 2016
Isotope-Engineering the Thermal Conductivity of Two-Dimensional MoS 2 journal January 2019
Lattice vibrational modes and phonon thermal conductivity of monolayer MoS 2 journal January 2014
Large Thermoelectricity via Variable Range Hopping in Chemical Vapor Deposition Grown Single-Layer MoS 2 journal April 2014
Thermal conductivity of monolayer MoS 2 , MoSe 2 , and WS 2 : interplay of mass effect, interatomic bonding and anharmonicity journal January 2016
Atomically Thin MoS2 A New Direct-Gap Semiconductor journal September 2010
Strain-induced semiconductor to metal transition in the two-dimensional honeycomb structure of MoS2 journal November 2011
Single-Layer MoS2 Phototransistors journal December 2011
Thermal conductivity of bulk and thin-film silicon: A Landauer approach journal May 2012
Ab initio study of the unusual thermal transport properties of boron arsenide and related materials journal December 2013
Ultrasensitive photodetectors based on monolayer MoS2 journal June 2013
Self-interaction correction to density-functional approximations for many-electron systems journal May 1981
Bandgap Engineering of Strained Monolayer and Bilayer MoS2 journal July 2013
Basal-plane thermal conductivity of few-layer molybdenum disulfide journal May 2014
Phonon transport in nanowires coated with an amorphous material: An atomistic Green’s function approach journal December 2003
Single-layer MoS2 transistors journal January 2011
Temperature-Dependent Raman Studies and Thermal Conductivity of Few-Layer MoS 2 journal April 2013
Thermal conductivity and phonon linewidths of monolayer MoS 2 from first principles journal December 2013
Large theoretical thermoelectric power factor of suspended single-layer MoS 2 journal November 2014
Ab Initio and Theoretical Study on Electron Transport through Polyene Junctions in between Carbon Nanotube Leads of Various Cuts journal May 2020
Role of crystal structure and junction morphology on interface thermal conductance journalarticle January 2015
Temperature Dependent Raman Studies and Thermal Conductivity of Few Layer MoS2 text January 2013
Thermal conductivity of monolayer MoS2, MoSe2, and WS2: Interplay of mass effect, interatomic bonding and anharmonicity text January 2015

Figures / Tables (6)