Patent ID: 7662521
Filing Date: 2010-02-16
Classification: G03F

Abstract:
1. A method of fabricating a phase shifting mask that comprises a main die region and a scribe region, the method comprising: forming a first resist layer over a light-blocker layer, the light-blocker layer located over a transparent substrate; patterning the first resist layer to form a first resist pattern; etching the light-blocker layer using the first resist pattern to form a light-blocker pattern; applying a second resist layer over the light-blocker pattern and the transparent substrate; patterning the second resist layer to form a second resist pattern, the second resist pattern fully covers the scribe region; etching the transparent substrate in the main die region using a combination of the light-blocker pattern and the second resist pattern as a mask; and removing the light-blocker pattern in the main die region using the second resist pattern as a mask; wherein at least part of the light-blocker pattern in the scribe region remains after the step of removing the light-blocker pattern in the main die region.