Patent ID: 7022452
Filing Date: 2006-04-04
Classification: G03F

Abstract:
1. A contrast enhanced photolithographic method, comprising: forming a photoresist layer on a substrate; forming on the photoresist layer a contrast enhancing system comprising a solution or dispersion comprising a photobleachable dye having a formula selected from the group consisting of wherein one or more of R, R1, and R2 represents a polar substituent group selected from a carboxylic acid, a substituted carboxylic acid, a hydroxyalkyl, and a substituted hydroxyalkyl; through an imaging pattern and through the contrast enhancing system exposing the photoresist layer to radiation having a wavelength between about 230 nm and about 300 nm; removing the contrast enhancing system; and developing the photoresist layer to form a photoresist pattern on the substrate.