Patent ID: 7682942
Filing Date: 2010-03-23
Classification: G03F,H01L

Abstract:
1. A method of making a pillar structure, comprising: providing a positive resist layer over at least one underlying layer; exposing the resist layer through a mask a first time; forming a first set of holes in the photoresist layer after exposing the resist the first time; exposing the resist layer through a mask a second time after the step of forming the first set of holes; and forming a second set of holes in the resist layer after exposing the resist the second time; narrowing the first and the second sets of holes; thereafter forming a filler material in the first and the second sets of holes; removing the resist layer to leave a filler material pattern over the at least one underlying layer; and etching the at least one underlying layer using the filler material pattern as a mask to form a plurality of pillars in the at least one underlying layer.