Comparison of Thermal Conductivities on Abraded and Untreated CVD-Diamond Obtained by Scanning Thermal Microscopy

Altes, A.; Heiderhoff, R.; Balk, L. J.; Jentsch, H. G.; Rosiwal, S. M.
March 2002
International Journal of Modern Physics B: Condensed Matter Phys;3/20/2002, Vol. 16 Issue 6/7, p922
Academic Journal
Diamond materials have become progressively significant in the fabrication of heat sinks for power devices and lasers. To investigate the influence of polishing on CVD-Diamond, the surfaces of 〈100〉 and 〈110〉 coatings were analyzed, after a first abrasive treatment on a 30µm diamond grit by scanning thermal microscopy based on a resistive platinum-probe. This technique describes in first order approximation the heat transfer of a metal-diamond interface. Through this method it was possible to diagnose a relevant reduction in thermal conductivity by a harsh sample preparation depending on the crystal orientation. The thermal conductivity of as deposited 〈100〉 diamond was measured at 1290 W/mK and was reduced to 520 W/mK. The thermal conductivity of as deposited 〈110〉 diamond was determined at 1780 W/mK whereas the same diamond surface, but abraded, shows a thermal conductivity of just 460 W/mK. Additionally the received images which represents the thermal conductivity qualitatively bring forward micro structures like e.g. grain boundaries.


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