Patent ID: 8268542
Filing Date: 2012-09-18
Classification: G03F

Abstract:
1. A method for forming a relief image on a substrate, said method comprising: (A) providing a coating of a photoresist layer over said substrate; (B) providing a coating of a barrier layer over said photoresist layer; (C) exposing said barrier layer to a first radiation through a first patterned mask; (D) baking said substrate after step (C) to form a bleached portion in said barrier layer, wherein said bleached portion of said barrier layer has substantially lower absorption than an unbleached portion of said barrier layer at an first imaging wavelength of said first radiation; (E) exposing at least a portion of said bleached portion of said barrier layer and said photoresist layer to a second radiation having an second imaging wavelength same as said first radiation through a second patterned mask to form a latent image, wherein said second patterned mask comprises a pattern prone to form side lobes in said photoresist layer layer, and said second patterned mask and said first patterned mask are the same mask; and (F) contacting said substrate after step (E) with an aqueous base solution, whereby at least a portion of said barrier layer and a portion of said photoresist are removed to form a patterned structure in said photoresist layer.