Patent ID: 7100322
Filing Date: 2006-09-05
Classification: G03F

Abstract:
1. A method of manufacturing an alternating phase shift mask having a 0° phase shift region and a 180° phase shift region, the method comprising: providing a substrate having thereon a blocking layer that is substantially opaque with respect to an exposure light, wherein the substrate is substantially transparent with respect to the exposure light; etching one portion of the blocking layer and the underlying portion of the substrate to form a trench in the substrate having a depth at which the exposure light will undergo a 180° phase shift when transmitted through the substrate at the trench, whereby the 180° phase shift region of the mask is formed at the trench; and subsequently forming a layer on the substrate that fills said trench and exposes another portion of the blocking layer, and etching said another portion of the blocking layer while the trench is filled and until another portion of the substrate is exposed, thereby forming the 0° phase shift region of the mask at said another exposed portion of the substrate.