INFRARED RAMAN-SCATTERING AS A SENSITIVE PROBE FOR THE THERMAL-CONDUCTIVITY OF CHEMICAL-VAPOR-DEPOSITED DIAMOND FILMS

The infrared Raman spectrum of chemical vapor deposited (CVD) diamond films has been correlated with the in-plane thermal conductivity of th e films. The scattering strength of the 1332 cm(-1) zone-center phonon line of diamond, measured relative to the intensity of the nondiamond carbon phase, was found to increase strongly with increasing thermal conductivity. A good correlation between these two properties was foun d even for the highest quality CVD diamond films with peak thermal con ductivities up to 54 W/cm K. The dependence of the peak thermal conduc tivity on the intensity of the 1332 cm(-1) phonon line normalized to t he scattering strength of the nondiamond carbon phase can be described by a power law with an exponent of 0.5. (C) 1996 American Institute o f Physics.