Patent ID: 7169545

Claim:
A resist exposure system comprising: a semiconductor wafer; a layer of photoresist composition formed over said semiconductor wafer, said layer of photoresist composition comprising a combination of a first photoresist X and a second photoresist Y, wherein said first photoresist X is characterized by a first glass transition temperature, said second photoresist Y is characterized by a second glass transition temperature, said second glass transition temperature is lower than said first glass transition temperature, said first photoresist X is characterized by an absorption spectrum exhibiting an operational absorption in the vicinity of a first wavelength, said second photoresist Y is characterized by an absorption spectrum exhibiting an operational absorption in the vicinity of a second wavelength, and said second wavelength is substantially shorter than said first wavelength; an exposure source configured to emit radiation of said first wavelength; and a mask positioned between said exposure source and said photoresist composition, wherein said mask defines an exposure pattern including portions having relatively high transmission at said first wavelength and portions having relatively low transmission at said first wavelength.