Ultralow Thermal Conductivity in Disordered, Layered WSe sub(2) Crystals

The cross-plane thermal conductivity of thin films of WSe sub(2) grown from alternating W and Se layers is as small as 0.05 watts per meter per degree kelvin at room temperature, 30 times smaller than the c-axis thermal conductivity of single-crystal WSe sub(2) and a factor of 6 smaller than the pre...

Full description

Saved in:
Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2007-01, Vol.315 (5810), p.351-353
Main Authors: Chiritescu, Catalin, Cahill, David G, Nguyen, Ngoc, Johnson, David, Bodapati, Arun, Keblinski, Pawel, Zschack, Paul
Format: Article
Language:English
Subjects:
Crystal structure
Crystals
Heat transfer
Localization
Measuring instruments
Stacking
Thermal conductivity
Thin films
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The cross-plane thermal conductivity of thin films of WSe sub(2) grown from alternating W and Se layers is as small as 0.05 watts per meter per degree kelvin at room temperature, 30 times smaller than the c-axis thermal conductivity of single-crystal WSe sub(2) and a factor of 6 smaller than the predicted minimum thermal conductivity for this material. We attribute the ultralow thermal conductivity of these disordered, layered crystals to the localization of lattice vibrations induced by the random stacking of two- dimensional crystalline WSe sub(2) sheets. Disordering of the layered structure by ion bombardment increases the thermal conductivity.
ISSN:0036-8075
DOI:10.1126/science.1136494