Patent ID: 6218313
Filing Date: 2001-04-17
Classification: G03F,H01L

Abstract:
A process for producing a semiconductor device, comprising the steps of:conducting a computerized simulation of light intensity using optical constants of a semiconductor substrate, a film of a light reflecting material, and a positive resist, while inputting a plurality of values for film thicknesses of said film of a light reflecting material, to determine an optimal thickness of said film of a light reflecting material that corresponds to a minimum absorption energy at an interface between said film of a light reflecting material and said resist;forming said film of a light reflecting material at said optimal thickness on said semiconductor substrate;coating said positive resist on said film of a light reflecting material;forming a resist pattern from said positive resist; andetching said film of a light reflecting material using said resist pattern as a mask,wherein said optical constants of said semiconductor substrate, said film of a light reflecting material and said resist are obtained by measuring said optical constants thereof, or when optical constants thereof are known, by using said known optical constants.