Patent ID: 6605417
Filing Date: 2003-08-12
Classification: G03F

Abstract:
In a method for the preparation of a patterned photoresist layer on a substrate surface comprising the steps of (a) forming a layer of a positive-working chemical-amplification photoresist composition on the substrate surface, (b) patternwise exposing the photoresist layer to actinic rays, (c) subjecting the patternwise light-exposed photoresist layer to a post-exposure baking treatment and (d) subjecting the photoresist layer after the post-exposure baking treatment to a development treatment with an aqueous alkaline developer solution, the improvement which comprises bringing the photoresist layer after the post-exposure baking treatment in step (c), prior to the development treatment in step (d), into contact with an aqueous acidic solution containing an aromatic sulfonic acid having two benzene nuclei or a naphthalene ring structure.