Patent ID: 8158958
Filing Date: 2012-04-17
Classification: B82Y,G03F

Abstract:
1. A flare evaluation method of an extreme ultraviolet (EUV) exposure apparatus, the method comprising: extracting direct constant (DC) flare reference data using a preliminary measurement pattern mask including a dummy mask having an open region wherein a preliminary measurement pattern is formed; providing a plurality of flare gauge sets, each set including an opaque pad, a measurement pattern, and a flare pattern, the measure pattern being disposed at an inside of the opaque pad to measure influence of a flare, the flare pattern being disposed at an outside of the opaque pad to generate the flare; and detecting a change of a photo resist measurement pattern caused by the flare pattern and the measurement pattern for each of the flare gauge sets, wherein an outer radius of the flare pattern increases by a predetermined amount according to the flare gauge set, and a shape of the flare pattern is a truncated round washer disposed symmetrically about the opaque pad.