IP Library Granted Patent US 7,022,594
Granted Patent B2
US 7,022,594 · App. 10/737,821 · Granted Apr 4, 2006

Manufacturing method which prevents abnormal gate oxidation

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Quick Facts
Patent No.
US 7,022,594
App. No.
10/737,821
Granted
Apr 4, 2006
Kind
B2
Abstract

A method for manufacturing a gate electrode structure for preventing abnormal oxidation of a refractory metal due to an oxidation process, includes forming an insulating film on a surface of a semiconductor substrate; forming an impurity diffused polysilicon film on the insulating film; forming an impurity diffusion preventing film on the impurity diffused polysilicon film; forming a silicon-based film on the impurity diffusion preventing film; forming a refractory metal on the silicon-based film; forming a nitride film on the refractory metal silicide film; patterning the impurity diffused polysilicon film, the impurity diffusion preventing film, the silicon-based film, the refractory metal silicide film and the nitride film on a gate electrode; and performing an oxidation process.

Claims (44)

1. A method for manufacturing a gate electrode structure comprising:

a step for forming an insulating film on a surface of a semiconductor substrate;

a step for forming an impurity diffused polysilicon film on said insulating film;

a step of forming an impurity diffusion preventing film on said impurity diffused polysilicon film;

a step for forming a refractory metal silicide film on said impurity diffusion preventing film;

a step for forming a nitride film on said refractory metal silicide film;

a step for patterning said impurity diffused polysilicon film, said impurity diffusion preventing film, said refractory metal silicide film and said nitride film as a gate electrode;

a step for forming a first spacer constituted by a silicon-based film on side surfaces of said gate electrode; and

an oxidation step for forming said first spacer into an oxide film,

wherein said silicon-based film is a polysilicon film.

2. A method for manufacturing a gate electrode structure according to claim 1 , wherein said silicon-based film is formed after said step for forming said insulating film, and said step for forming said impurity diffused polysilicon film is then carried out.

3. A method for manufacturing a gate electrode structure comprising:

a step for forming an insulating film on a surface of a semiconductor substrate;

a step for forming an impurity diffused polysilicon film on said insulating film;

a step of forming an impurity diffusion preventing film on said impurity diffused polysilicon film;

a step for forming a refractory metal silicide film on said impurity diffusion preventing film;

a step for forming a nitride film on said refractory metal silicide film;

a step for patterning said impurity diffused polysilicon film, said impurity diffusion preventing film, said refractory metal silicide film and said nitride film as a gate electrode;

a step for forming a first spacer constituted by a silicon-based film on side surfaces of said gate electrode; and

an oxidation step for forming said first spacer into an oxide film,

wherein said silicon-based film is an amorphous silicon film.

4. A method for manufacturing a gate electrode structure according to claim 3 , wherein said silicon-based film is formed after said step for forming said insulating film, and said step for forming said impurity diffused polysilicon film is then carried out.

5. A method for manufacturing a gate electrode structure, comprising:

forming an insulating film on a surface of a semiconductor substrate;

forming an impurity diffused polysilicon film on said insulating film;

forming an impurity diffusion preventing film on said impurity diffused polysilicon film;

forming a refractory metal silicide film on said impurity diffusion preventing film;

forming a nitride film on said refractory metal silicide film;

patterning said impurity diffused polysilicon film, said impurity diffusion preventing film, said refractory metal silicide film and said nitride film as a gate electrode;

forming a first spacer constituted by a silicon-based film on side surfaces of said gate electrode; and

oxidizing said first spacer into an oxide film,

wherein said silicon-based film is a polysilicon film.

6. A method for manufacturing a gate electrode structure according to claim 5 , wherein said silicon-based film is formed after said forming an insulating film, and said forming an impurity diffused polysilicon film is then carried out.

7. A method for manufacturing a gate electrode structure, comprising:

forming an insulating film on a surface of a semiconductor substrate;

forming an impurity diffused polysilicon film on said insulating film;

forming an impurity diffusion preventing film on said impurity diffused polysilicon film;

forming a refractory metal suicide film on said impurity diffusion preventing film;

forming a nitride film on said refractory metal suicide film;

patterning said impurity diffused polysilicon film, said impurity diffusion preventing film, said refractory metal silicide film and said nitride film as a gate electrode;

forming a first spacer constituted by a silicon-based film on side surfaces of said gate electrode; and

oxidizing said first spacer into an oxide film,

wherein said silicon-based film is an amorphous silicon film.

8. A method for manufacturing a gate electrode structure according to claim 7 , wherein said silicon-based film is formed after said forming an insulating film, and said forming an impurity diffused polysilicon film is then carried out.