Patent ID: 6492701
Filing Date: 2002-12-10
Classification: H01L

Abstract:
A semiconductor device, comprising:a semiconductor substrate; a reflective pattern formed on the semiconductor substrate; an anti-reflective cap formed on the reflective pattern, for reducing reflection of light used for a photolithography process by interfering first light reflected from the reflective pattern with second light reflected from the anti-reflective cap, wherein the anti-reflective cap has a selected thickness and a selected refractive index sufficient to provide destructive interference between the first and second lights; and an anti-reflective spacer formed on side walls of the reflective pattern, for reducing reflection of the light used for a photolithography process by absorbing the first light reflected from the reflective pattern, wherein the anti-reflective spacer has a selected thickness and a selected extinction coefficient sufficient to absorb the first light, wherein the semiconductor device further comprises a conductive film formed in contact with the semiconductor substrate, and an anti-reflective layer formed above the conductive film, the anti-reflective cap and the anti-reflective spacer, for reducing light reflected from the conductive film.