Ultralow thermal conductivity in disordered, layered WSe2 crystals

Catalin Chiritescu, David G. Cahill, Ngoc Nguyen, David Johnson, Arun Bodapati, Pawel Keblinski, Paul Zschack

Research output: Contribution to journalArticlepeer-review

Abstract

The cross-plane thermal conductivity of thin films of WSe2 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 WSe2 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 WSe2 sheets. Disordering of the layered structure by ion bombardment increases the thermal conductivity.

Original languageEnglish (US)
Pages (from-to)351-353
Number of pages3
JournalScience
Volume315
Issue number5810
DOIs
StatePublished - Jan 19 2007

ASJC Scopus subject areas

  • General

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