Patent ID: 6171927
Filing Date: 2001-01-09
Classification: H01L

Abstract:
A method for producing an intermediate semi-conductor device structure, the method comprising:(a) patterning an oxidation mask layer disposed on a substrate to create a first window region and a second window region, wherein the first and second window regions are generally equal in size;(b) forming a layer of resist on the oxidation mask layer,(c) patterning the layer of resist to cover the second window region and not the first window region;(d) nitridizing the first window region, the second window region remaining non-nitridized;(e) stripping the layer of resist from the oxide layer;(f) oxidizing the substrate to form a nitridized field oxide in the first window region and a non-nitridized field oxide in the second window region, the nitridized field oxide being thinner than the non-nitridized field oxide, the thinner nitriidized field oxide having less of a bird's beak than the non-nitridized field oxide; and(g) stripping the oxidation mask from the substrate.