Manufacturing method which prevents abnormal gate oxidation
View Patent ↗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.
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.