Patent ID: 8568964

Claim:
A method of patterning a substrate, comprising: forming a layer of radiation-sensitive material on a substrate; performing a patterned exposure of said layer of radiation-sensitive material using a mask having a mask critical dimension to form first radiation-sensitive material portions having a high radiation exposure, second radiation-sensitive material portions having a low radiation exposure, and third radiation-sensitive material portions having an intermediate radiation exposure; performing a first post-exposure bake following said performing said patterned exposure; performing positive-tone developing of said layer of radiation-sensitive material to remove said first radiation-sensitive material portions from said substrate; performing a flood exposure of said layer of radiation-sensitive material; performing a second post-exposure bake following said performing said flood exposure; and performing negative-tone developing of said layer of radiation-sensitive material to remove said second radiation-sensitive material portions from said substrate, wherein said third radiation-sensitive material portions remain after performing said positive-tone and negative-tone developing.