Area Selective Laser Chemical Vapor Deposition of Diamond

Abstract

ABSTRACTHigh quality diamond spots were deposited on silicon substrates by a hot filament process combined with laser heating. A mixture of CH4(1.8 vol%) and H2was passed over a tantalum filament having a temperature of about 2200 °C. The substrate temperature was varied by small adjustments of the filament power. A focused laser beam was used to locally raise the temperature on the substrate surface. By a proper choice of filament temperature, background substrate temperature and laser induced temperature, isolated islands of polycrystalline diamond could be deposited on the silicon substrate. The deposited diamond spots were characterized by micro-Raman spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and scanning force microscopy.