Patent ID: 7413831
Filing Date: 2008-08-19
Classification: B82Y,G03F

Abstract:
1. A method for producing a reflective exposure mask, the reflective exposure mask including: a stack of reflective layers for reflecting exposure light; an absorber film functioning to absorb said exposure light for covering a light reflection plane side of said stack of reflective layers with a predetermined pattern; and a buffer film interposed between said stack of reflective layers and said absorber film; said method comprising the steps of: specifying a swing effect and a bulk effect, which occur on a transferred image on said exposure object due to multiple reflections within said absorber film and said buffer film to at least one fluctuation of a line width and pattern shift in a transferred portion of said predetermined pattern, in accordance with characteristic values of forming materials of said absorber film and said buffer film and optical conditions when exposing, upon deciding a forming film thickness of said absorber film; and deciding an optical density that is a deciding condition of said forming film thickness of said absorber film in consideration of said specified swing effect and said specified bulk effect so that said fluctuation of said line width of said pattern and/or pattern shift of said pattern is minimized.