INFLUENCE OF THERMAL BARRIERS ON HEAT-FLOW IN HIGH-QUALITY CHEMICAL-VAPOR-DEPOSITED DIAMOND

Thermal barriers in high quality chemical vapor deposited (CVD) diamon d were investigated by photothermal microscopy. High resolution measur ements confirm that the in-plane heat transport is strongly limited by the presence of thermal barriers. Thermal resistances in the range of 10(-9) to 10(-8) m(2)K/W located at grain boundaries are extracted fr om photothermal line scans. Recently published data on macroscopic one -dimensional thermal transport in CVD diamond are well explained by th e microscopic measurements in connection with a simple one-dimensional heat flow model.