Mask including optical shield layer having variable light transm

Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Radiation mask

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G03F 900

Patent

active

060486481

ABSTRACT:
In a mask including an optical shield layer formed on a transparent substrate, the light transmittance of the shield layer is changed in accordance with the density of patterns of the shield layer or the thickness of a photoresist layer on a semiconductor substrate.

REFERENCES:
patent: 5318868 (1994-06-01), Hasegawa et al.
patent: 5490896 (1996-02-01), Yagi et al.

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