Fujitsu Corporation

Keisuke Okazaki

Kenichi Goto

Hideo Takagi

Tatsuya Yamazaki

Atsuo Fushida

Yuzuru Ota

Takae Sukegawa

Masataka Kase

Takashi Sakuma

A method of manufacturing a semiconductor device with a silicide electrode is provided which can form a good contact even at a scaled-down pattern. The method includes the steps of: forming an insulated gate structure with side wall spacer on a p-type region of a silicon (Si) substrate; implanting arsenic ions in source/drain regions at a dose less than 5&times;10,cm,; forming a laminated layer of a Co film and a TiN film on the surface of the substrate; heating the substrate to let the Co film react with an underlying Si region for silicidation; and removing the TiN film. Another method includes the steps of: forming a field oxide film on the surface of a silicon (Si) substrate for element isolation; implanting ions in the surface region of the Si substrate defined by the field oxide film to form a conductive silicon region; depositing a Co film on the Si surface extending to the field oxide film; heating the Si substrate under such conditions of a time and a temperature that does not allow CoSi,to be formed, and lets the Co film react with the conductive silicon region for silicidation, thereby forming Co silicide; removing an unreacted Co film; and subjecting the Si substrate to another heat treatment to convert the Co silicide to CoSi,.

Manufacture of semiconductor device with salicide electrode

A manufacturing method of a semiconductor device of the present invention comprises the steps of forming an amorphous layer on an upper layer of the impurity diffusion layer made of silicon by virtue of ion-implantation, forming a cobalt film on the impurity diffusion layer, forming a cobalt silicide layer made of Co.sub.2 Si or CoSi on an upper layer of the amorphous layer at a low temperature by reacting the cobalt film to silicon in the impurity diffusion layer in virtue of first annealing, then removing the cobalt film which has not reacted, and changing Co.sub.2 Si or CoSi constituting the cobalt silicide layer into CoSi.sub.2 to have low resistance and also rendering the cobalt silicide layer to enter into a depth identical to or deeper than an initial depth of the amorphous layer in virtue of second annealing.

Method of manufacturing semiconductor device

Growing community of inventors

Kawasaki, Japan

Keisuke Okazaki