Patent ID: 7126172

Claim:
A method for forming a multi gate oxide structure, comprising the steps of: providing a semiconductor substrate having an initial oxide layer thereon; depositing and patterning a first layer of photoresist on the initial oxide layer, thereby forming a first region in which the initial oxide layer is exposed; etching the initial oxide layer within the first region, thereby forming a first etched region; forming a first gate oxide layer within the first etched region; depositing and patterning a second layer of photoresist on the initial oxide layer and first oxide layer, thereby forming a second region in which the initial oxide layer is exposed; etching the exposed initial oxide layer within the second region, thereby forming a second etched region; and growing a second oxide layer within the second etched region; wherein the first etched region is vertically disposed by a distance d 1 from a major surface of the substrate, wherein the second etched region is vertically disposed by a distance d 2 from the major surface, and wherein d 2 >d 1 .