Patent ID: 8568960
Filing Date: 2013-10-29
Classification: G03F,Y10S

Abstract:
1. A method comprising: forming a film of a photoresist composition on a substrate, said photoresist composition comprising a polymer having a structure comprising at least one acid labile group or at least one base soluble group, a photosensitive acid generator, and a photosensitive base generator, said photosensitive acid generator capable of generating a first amount of acid upon exposure to a first dose of radiation, said photosensitive acid generator capable of generating a second amount of acid upon exposure to a second dose of radiation, said second amount of acid greater than said first amount of acid, said second dose of radiation greater than said first dose of radiation, said photosensitive base generator capable of generating a first amount of base upon exposure to said first dose of radiation, said photosensitive base generator capable of generating a second amount of base upon exposure to said second dose of radiation, said first amount of base greater than said first amount of acid, said second amount of base less than said second amount of acid; exposing a first region of said film to radiation through a first mask having a first image pattern; and exposing a second region of said film to radiation through a second mask having a second image pattern; wherein said photoresist composition further comprises a base proliferator, said base proliferator comprising a compound capable of generating a second base through catalytic reaction with a first base; wherein said base proliferator is selected from the group consisting of: wherein R wherein either: