Giant Thermal Conductivity Enhancement in Multilayer MoS2 under Highly Compressive Strain

Abstract

Multilayer MoS2 possesses highly anisotropic thermal conductivities along in-plane and cross-plane directions that could hamper heat dissipation in electronics. With about 9% cross-plane compressive strain created by hydrostatic pressure in a diamond anvil cell, we observed about 12 times increase in the cross-plane thermal conductivity of multilayer MoS2. Our experimental and theoretical studies reveal that this drastic change arises from the greatly strengthened interlayer interaction and heavily modified phonon dispersions along cross-plane direction, with negligible contribution from electronic thermal conductivity, despite its enhancement of 4 orders of magnitude. The anisotropic thermal conductivity in the multilayer MoS2 at ambient environment becomes almost isotropic under highly compressive strain, effectively transitioning from 2D to 3D heat dissipation. This strain tuning approach also makes possible parallel tuning of structural, thermal and electrical properties, and can be extended to the whole family of 2D Van der Waals solids, down to two layer systems.

38 pages including maintext and SI, 5 figures for maintext

References in corpus (13)

• Atomically thin MoS2: A new direct-gap semiconductor
• Restoring the density-gradient expansion for exchange in solids and surfaces
• Generalized gradient approximation for solids and their surfaces
• Bandgap Engineering of Strained Monolayer and Bilayer MoS2
• Elastic properties of freely suspended MoS2 nanosheets
• Experimental demonstration of continuous electronic structure tuning via strain in atomically thin MoS2
• Temperature Dependent Raman Studies and Thermal Conductivity of Few Layer MoS2
• Semiconductor-metal transition in semiconducting bilayer sheets of transition metal dichalcogenides
• Effect of strain on electronic and thermoelectric properties of few layers to bulk MoS${}_2$
• Measurement of refractive index and equation of state in dense He, H2, H2O, Ne under high pressure in a diamond-anvil cell
• Thermal transport properties of metal/MoS2 interfaces from first principles
• Picosecond Transient Thermoreflectance for Thermal Conductivity Characterization
• Biaxial tensile strain tuned up-and-down behavior on lattice thermal conductivity in $\beta$-AsP monolayer

Cited by in corpus (6)

• Transforming heat transfer with thermal metamaterials and devices
• High intrinsic lattice thermal conductivity in monolayer MoSi${}_2$N${}_4$
• Twist-induced magnon Landau levels in honeycomb magnets
• Electrically driven robust tuning of lattice thermal conductivity
• Modulation of heat transport in two-dimensional group-III chalcogenides
• Strain-Modulated Interlayer Charge and Energy Transfers in MoS2/WS2 Heterobilayer