Patent ID: 7074527

Claim:
A method of patterning a first resist on a semiconductor wafer using a mask, the method comprising: providing a semiconductor substrate having a plurality of semiconductor die; forming a first resist over the semiconductor substrate; reflecting radiation off of the mask to create reflected radiation, wherein the mask comprises: providing a substrate; forming a reflective stack over the substrate; forming an absorber over the reflective stack; forming a first hardmask layer over the absorber, wherein the first hardmask layer comprises carbon; forming a second hardmask layer over the first hardmask layer, wherein the second hardmask layer has a thickness no greater than approximately 20 nanometers; forming a second resist over the second hardmask layer; patterning the second resist to form a first pattern; transferring the first pattern from the second resist to the second hardmask layer and the first hardmask layer; removing the second resist; transferring the first pattern from the first hardmask layer and the second hardmask layer to the absorber; and removing the first hardmask layer and the second hardmask layer; and exposing the first resist to the reflected radiation to form a second pattern in the first resist.