Patent ID: 6743712
Filing Date: 2004-06-01
Classification: H01L,Y10S

Abstract:
A method of making a semiconductor device comprising:forming a dielectric layer on a substrate; forming a sacrificial layer on the dielectric layer; forming on the sacrificial layer a layer of photoresist; patterning the photoresist layer; removing part of the sacrificial layer to generate an etched sacrificial layer that has a tapered etch profile; etching the dielectric layer where located below the removed part of the sacrificial layer; and removing the etched sacrificial layer after the dielectric layer is etched wherein the patterned photoresist layer has a first opening that is less than about 220 nanometers in diameter and wherein the etched sacrificial layer has a second opening that is smaller than the first opening and that is less than about 100 nanometers in diameter.