Patent ID: 6200734
Filing Date: 2001-03-13
Classification: G03F,H01L,Y10S

Abstract:
A method for fabricating semiconductor devices comprising the steps of:forming an antireflection coating on a non-planar surface of a semiconductor substrate, the anti-reflection coating comprising at least two layers of silicon-containing oxide with different ratios of silicon-to-oxide, different indices of refraction, and different extinction coefficients, a first layer of oxide adjacent to the substrate having an extinction coefficient within the range 0.7 to 1.9, and a second oxide layer having an index of refraction in the range 1.7 to 2.0; wherein the first layer has the highest silicon concentration of said at least two layers of silicon-containing oxide, wherein the ratio of silicon-to-oxide of the first layer of oxide is greater than the ratio of silicon-to-oxide in the second oxide layer;forming a layer of energy-sensitive material over the coating; andexposing the energy-sensitive layer to radiation to introduce a patterned image into the energy-sensitive layer.