Patent ID: 6022811
Filing Date: 2000-02-08
Classification: C23C,C30B,H01L

Abstract:
A CVD method comprising the steps of:setting a semiconductor wafer on a heating stage within a chemical vapor deposition (CVD) reaction chamber;emitting a CVD reaction gas towards at least the central major region of said wafer from a first gas blowing region of a gas head provided opposing said wafer and having a plurality of gas blowing regions separated from each other, and simultaneously emitting an inert gas towards the peripheral region of said wafer from a second gas blowing region of said gas head, while maintaining the temperature of said wafer at a predetermined temperature and maintaining the pressure of said CVD reaction chamber within a range from 100 Torr to atmospheric pressure, andreducing the amount of reaction gas consumed, thereby reducing the amount of undesirable precipitated particles wherein said wafer has a substantially circular cross section,said first gas blowing region is substantially circular in cross section having a diameter 30 to 50 mm smaller than that of said wafer, andsaid second gas blowing region surrounds said first gas blowing region.