Patent ID: 8330937
Filing Date: 2012-12-11
Classification: G03F

Abstract:
1. A lithography system, comprising: a lens system; a support proximate the lens system, the support configured to carry a semiconductor workpiece having a resist disposed thereon; a light source proximate the lens system, the light source configured to expose the resist on the semiconductor workpiece at an exposure dose; a stray light measurement device configured to measure stray light of the lithography system; memory configured to store a measurement of the stray light of the lithography system, a threshold level for the stray light, a resist sensitivity factor of a reference resist and a resist sensitivity factor of the resist disposed on the semiconductor workpiece; and a processor configured to determine a stray light dose control factor of the lithography system as a function of at least the measurement of the stray light, the sensitivity factor of the reference resist and the sensitivity factor of the resist.