Engineering Heat Transport Across Epitaxial Lattice-Mismatched van der Waals Heterointerfaces

Artificially engineered 2D materials offer unique physical properties for thermal management, surpassing naturally occurring materials. Here, using van der Waals epitaxy, we demonstrate the ability to engineer extremely insulating thermal metamaterials based on atomically thin lattice-mismatched BiS...

Full description

Bibliographic Details
Authors: Chávez Ángel, Emigdio|||0000-0002-9783-0806, Tsipas, Polychronis|||0000-0001-9064-9601, Xiao, Peng|||0000-0002-4711-2566, Ahmadi, Mohammad Taghi, Daaoub, Abdalghani H. S., Sadeghi, Hatef|||0000-0001-5398-8620, Sotomayor Torres, Clivia M.|||0000-0001-9986-2716, Dimoulas, Athanasios|||0000-0003-3199-1356, Sachat, Alexandros el|||0000-0003-3798-9724
Format: article
Publication Date:2023
Country:España
Institution:Universitat Autònoma de Barcelona
Repository:Dipòsit Digital de Documents de la UAB
Language:English
OAI Identifier:oai:ddd.uab.cat:283421
Online Access:https://ddd.uab.cat/record/283421
https://dx.doi.org/urn:doi:10.1021/acs.nanolett.3c01280
Access Level:Open access
Keyword:Phonon transport
Thermal conductivity
Frequency-domain thermoreflectance BiSe/MoSe
Graphene/pdse
Description
Summary:Artificially engineered 2D materials offer unique physical properties for thermal management, surpassing naturally occurring materials. Here, using van der Waals epitaxy, we demonstrate the ability to engineer extremely insulating thermal metamaterials based on atomically thin lattice-mismatched BiSe/MoSe superlattices and graphene/PdSe heterostructures with exceptional thermal resistances (70-202 m 2 K/GW) and ultralow cross-plane thermal conductivities (0.012-0.07 W/mK) at room temperature, comparable to those of amorphous materials. Experimental data obtained using frequency-domain thermoreflectance and low-frequency Raman spectroscopy, supported by tight-binding phonon calculations, reveal the impact of lattice mismatch, phonon-interface scattering, size effects, temperature, and interface thermal resistance on cross-plane heat dissipation, uncovering different thermal transport regimes and the dominant role of long-wavelength phonons. Our findings provide essential insights into emerging synthesis and thermal characterization methods and valuable guidance for the development of large-area heteroepitaxial van der Waals films of dissimilar materials with tailored thermal transport characteristics.

Similar Items