Patent ID: 6340557
Filing Date: 2002-01-22
Classification: G03F,H01L

Abstract:
A pattern formation method comprising:depositing an anti-reflection coating of an organic material for absorbing an energy beam on an etching target film formed on a semiconductor substrate; depositing a photosensitive film on said anti-reflection coating; forming a patterned photosensitive film by selectively irradiating said photosensitive film with said energy beam and removing an exposed or unexposed portion of said photosensitive film; forming a patterned anti-reflection coating by conducting dry etching on said anti-reflection coating by using said patterned photosensitive film as a mask and using an etching gas containing sulfur; and forming a pattern out of said etching target film by conducting dry etching on said etching target film by using said patterned photosensitive film as a mask, wherein said anti-reflection coating has a thickness which is uniform such that a top face of said anti-reflection coating longitudinally varies in line with a top face of said etching target film, said photosensitive film is made from a photosensitive material including a sulfonyl compound.