Patent ID: 6348418
Filing Date: 2002-02-19
Classification: G03F,Y10S

Abstract:
A method of forming a photoresist pattern, comprising the steps:(a) forming a first metal silicide film on a substrate; (b) forming a second metal silicide film on the first metal silicide film, wherein the second metal silicide film is a silicon rich tungsten silicide film; (c) etching of the second metal silicide film, wherein the second metal silicide film and a portion of the first metal silicide film are removed; (d) making the resulting surface layer of the first metal silicide film hydrophobic; (e) then coating the first metal silicide film with a photoresist so as to form a photoresist film on the etched surface layer of the first metal silicide film; and (f) patterning the photoresist film by photolithography; and (g) wherein said etching of the surface layer of the metal silicide film is carried out with a liquid containing hydrogen peroxide before said coating of the photoresist; (h) wherein said step of making the surface layer of the metal silicide film hydrophobic is carried out by exposing the surface layer of the metal silicide film to hexamethyldisilazane atmosphere diluted with xylene; (i) wherein said photoresist is a chemical amplification photoresist having a base resin, which is to be insoluble with an alkaline solvent when a protection radical is in a bonded state at a predetermined portion and to be soluble with the alkaline solvent when the protection radical is in a free state, and a photoionizer, which emits hydrogen ions upon exposure to light, said base resin being soluble with the alkaline solvent when said protection radical is freed in response to reaction of the hydrogen ions, which are emitted by said photoionizer, and said base resin; and (j) wherein said first metal silicide film is tungsten silicide film; and (k) wherein said tungsten silicide film is formed of at least dichlorosilane (SiH2Cl2) and tungsten hexafluoride (WF6) as raw material.