Patent ID: 7632611
Filing Date: 2009-12-15
Classification: G03F

Abstract:
1. A method of manufacturing a rim type of photomask, comprising: forming a light blocking layer, that is substantially opaque to an exposure light, on a quartz substrate; patterning the light blocking layer and etching the quartz substrate to a predetermined depth to form a 180°-phase shift region constituted by the etched portion of the substrate; subsequently depositing a fluid material on the quartz substrate thinly enough to have step coverage with respect to the topology of the substrate to thereby form a fluid material layer that covers a central portion of the patterned light blocking layer and leaves an outer peripheral portion of the patterned light blocking layer exposed; subsequently etching the patterned light blocking layer to thereby form a light blocking pattern therefrom that remains over a portion of the surface of the substrate on which the light blocking layer was formed and exposes said surface along a border adjacent the 180°-phase shift region; and removing the fluid material layer.