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 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 946675
- Report Number(s):
- ANL/XSD/JA-57823; TRN: US200903%%455
- Journal Information:
- Scienceexpress, Vol. 315, Issue 5810 ; Jan. 2007
- Country of Publication:
- United States
- Language:
- ENGLISH
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