Patent ID: 7601467

Claim:
A method of manufacturing an extreme ultra-violet lithography (EUVL) alternating phase-shift mask, the method comprising: preparing a substrate having a reflective layer including a plurality of layers formed of a first material, alternately stacked with a plurality of layers formed of a second material; forming a light-shielding layer pattern on the reflective layer to cover part of the reflective layer while leaving a reflective region of the reflective layer exposed; forming a trench in a phase-shift region within the reflective region by etching the reflective layer; forming a photoresist pattern on the light-shielding layer pattern and on the phase-shift region within the reflective layer to cover the light-shielding layer pattern and the phase-shift region while leaving a non phase-shift region within the reflective region exposed; and changing the physical structure of the non phase-shift region within the reflective region by applying a physical shock to the non phase-shift region using the photoresist pattern as a mask to lower a reflectivity of the non phase-shift region with respect to extreme ultra-violet (EUV) light.