Limits to Fourier theory in high thermal conductivity single crystals
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2015-11-16 |
| Journal | Applied Physics Letters |
| Authors | Richard B. Wilson, David G. Cahill |
| Institutions | University of Illinois Urbana-Champaign |
| Citations | 46 |
Abstract
Section titled āAbstractāWe report the results of time-domain thermoreflectance (TDTR) experiments that examine the ability of Fourier theory to predict the thermal response in single crystals when heater dimensions are small. We performed TDTR measurements on Al-coated diamond, 6H-SiC, GaP, Ge, MgO, GaAs, and GaSb single crystals with a wide range of laser spot size radii, 0.7 Ī¼m < w0 < 12 Ī¼m. When the laser spot-size is large, w0 ā 12 Ī¼m, TDTR data for all crystals are in agreement with predictions of Fourier theory with bulk thermal conductivity values. When the laser spot-size is small, w0 < 2 Ī¼m, there are significant differences between the predictions of Fourier theory and TDTR data for all crystals except MgO.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
Section titled āReferencesā- 2014 - Near-junction thermal management: Thermal conduction in gallium nitride composite substrates