Patent ID: 9091923
Filing Date: 2015-07-28
Classification: G03F

Abstract:
1. A method for forming a pattern on a substrate, the method comprising: dividing the pattern, which has a pitch of W+S, into two component patterns such that each of the component patterns has a pitch 2W+2S, wherein W is a width of a feature and S is a distance between two adjacent features; exposing the photoresist layer of the substrate to a first UV light with a wavelength through a first mask corresponding to a first one of the component patterns, wherein the substrate includes a photoresist layer comprising photoacid generators (“PAGs”) and photobase generators (“PBGs”); and subsequent to the exposing the photoresist layer of the substrate to the first UV light with the wavelength through the first mask, exposing the photoresist layer of the substrate to a second UV light with the same wavelength as the first UV light through a second mask corresponding to a second one of the component patterns, wherein the PAGs in first areas of the photoresist layer that have been exposed to one or both of the first and the second UV light are activated, and wherein the PBGs in second areas of the photoresist layer that have been exposed to both the first and the second UV light are activated, and wherein the activated PAGs neutralize the activated PBGs in the second areas of the photoresist layer that have been exposed to both the first and the second UV light, such that a resultant pattern on the substrate has the pitch W+S.