Patent ID: 9201304
Filing Date: 2015-12-01
Classification: G03F

Abstract:
1. A pattern forming process comprising the steps of: coating a chemically amplified resist composition onto a processable substrate, said resist composition comprising a resin comprising recurring units having an acid labile group which is eliminatable with acid so that it may turn insoluble in organic solvent as a result of the acid labile group being eliminated, a photoacid generator capable of generating an acid upon exposure to high-energy radiation, and a first organic solvent, prebaking the coating to remove the unnecessary solvent and to form a resist film, exposing patternwise the resist film to high-energy radiation, post-exposure baking, and developing in an organic solvent developer to form a negative pattern, heating the negative pattern to render it resistant to a second organic solvent, coating a solution comprising at least one element selected from the group consisting of silicon, titanium, zirconium, hafnium, and aluminum and the second organic solvent onto the negative pattern-bearing substrate, prebaking, and dry etching to effect image reversal for converting the negative pattern into a positive pattern.