Patent ID: 7838183
Filing Date: 2010-11-23
Classification: G03F

Abstract:
1. A fabrication method for an attenuated phase shift mask for a substrate having a first layer of attenuating material over said substrate, having a second layer of attenuating material over said first layer of attenuating material, and having an opaque layer over said second layer of attenuating material, the fabrication method comprising: depositing the first layer of attenuating material comprising a material for allowing about twelve percent transmission of radiation to about 20 percent transmission of radiation therethrough and shifting the phase of any passing radiation; etching said substrate to form at least one completely transmissive region; etching said substrate to form at least one slightly attenuated region, said etching including forming a second patterned resist over said substrate; and etching said substrate to form at least one highly attenuated region.