Abstract
Four diamond films were prepared by the multi-cathode direct current plasma-assisted chemical vapor deposition (DC-PACVD) method and optical and thermal properties were characterized. Optical transmission and thermal conductivity were strongly dependent on the power density and the methane concentration. Impurities such as, H, Na, Al, Si, K, Ca and Ta were detected by SIMS analysis. The Ta concentration in diamond films was found to be around 300 ppm by RBS measurement and Ta inclusion originated from the Ta cathode kept above 2100°C. Optical and thermal properties of the diamond film deposited with a growth rate of 4 μm/h at 0.37 kW/cm 2 (17 kW on φ76 mm substrate) and 5% CH 4 were similar to that of the type IIa natural diamond.
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