Hexagonal boron nitride particles for determining the thermal conductivity of diamond films based on near-ultraviolet micro-Raman mapping
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-05-23 |
| Journal | Journal of Physics D Applied Physics |
| Authors | Brian Squires, B. Logan Hancock, Mohammad Nazari, Jonathan Anderson, Karl D. Hobart |
| Institutions | United States Naval Research Laboratory, Texas State University |
| Citations | 5 |
Abstract
Section titled āAbstractāStudies are reported of the thermal conductivity () for a supported ~1 Āµm thick diamond membrane. Near-ultraviolet micro-Raman spectroscopy is used to map the temperature rise produced in the diamond by a micro-fabricated heater and in hexagonal boron nitride micro/nano-particles which are dispersed on the surface as local temperature sensors. Thermal conductivity is determined analytically from Raman temperature rise and also by fitting data via simulation, using a Monte Carlo optimization approach. The low value obtained for , W mā1 Ā· K, is attributed to the nanocrystalline diamond grain structure as analyzed by transmission electron microscopy (TEM). TEM identifies a disordered silicon-carbon interfacial layer ~2 nm thick which is expected to affect the diamond/silicon thermal boundary resistance.