Patent ID: 6812148
Filing Date: 2004-11-02
Classification: C23C,H01L

Abstract:
A method of forming a gate oxide on a substrate, the method comprising:providing a substrate having thereon a plurality of trenches separated by a patterned pad oxide and a patterned silicon nitride layer disposed thereon and used to form the plurality of trenches; forming a plurality of first oxide layers in the trenches as field oxides of a semiconductor device; removing the patterned silicon nitride layer and the patterned pad oxide layer to expose a surface of the substrate as an active area of the semiconductor device; introducing a flow of oxygen and nitrogen with a predetermined flow ratio for performing an ion drive-in to the active area at a predetermined temperature; forming a second oxide layer on the active area; removing the second oxide layer to expose the active area; and forming a third oxide layer on the active area as a gate oxide of the semiconductor device.