Abstract: A method of manufacturing a semiconductor device according to the present invention includes the steps of introducing first impurities of a first conductivity type into a main surface of a semiconductor substrate 1 to form a first impurity region, introducing second impurities of a second conductivity type to form a second impurity region, forming a first nickel silicide film on the first impurity region and forming a second nickel silicide film on the second impurity region, removing an oxide film formed on each of the first and second nickel silicide films by using a mixed gas having an NH3 gas and a gas containing a hydrogen element mixed therein, and forming a first conducting film on the first nickel silicide film and forming a second conducting film on the second nickel silicide film, with the oxide film removed.

Abstract: A low resistance Co silicide layer with less leakage current is formed over the surface of the source and drain of a MISFET by optimizing the film forming conditions and annealing conditions upon formation of Co (cobalt) silicide. More specifically, a low resistance source and drain (n+ type semiconductor regions, p+ type semiconductor regions) with less junction leakage current are formed, upon formation of a Co silicide layer by heat treating a Co film deposited over the source and drain (n+ type semiconductor regions, p+ type semiconductor regions) of the MISFET, by depositing the Co film at a temperature as low as 200° C. or less, carrying out heat treatment in three stages to convert the Co silicide layer from a dicobalt silicide (Co2Si) layer to a cobalt monosilicide (CoSi) layer and, then, to a cobalt disilicide (CoSi2) layer, successively.

Abstract: In a semiconductor device, the ohmic contact at the junction between the metal interconnection and the semiconductor layer is lowered by depositing a first conductor layer comprised of, for example, tungsten nitride and a second conductor layer comprised of, for example, tungsten silicide successively from the lower layer so as to cover the upper surface of intermediate conductive layers comprised of a metal, for example, tungsten as a main interconnection material, subsequently introducing an impurity, for example, boron (b) to the second conductor layer, then patterning the first and the second conductor layers thereby forming a conductor layer, and then forming a lower semiconductor layer comprised of, for example, polycrystal silicon for forming a semiconductor region for source and drain of load MISFET of SRAM so as to be in contact with the conductor layer.

Abstract: A barrier metal layer having a two-layer structure of a titanium film and a titanium nitride film is formed on the inner surface of a through hole. The titanium film and the titanium nitride film are formed on a main surface of an interlayer insulating film as well. In forming the barrier metal layer, a deposition device is used that is capable of high-directivity sputtering using a titanium target, and includes a substrate bias system biasing a semiconductor substrate to a high frequency voltage to attract sputter particles from the titanium target to the semiconductor substrate. This allows the titanium nitride film to be formed as an amorphous metal film.

Abstract: In a semiconductor device, the ohmic contact at the junction between the metal interconnection and the semiconductor layer is lowered by depositing a first conductor layer comprised of, for example, tungsten nitride and a second conductor layer comprised of, for example, tungsten silicide successively from the lower layer so as to cover the upper surface of intermediate conductive layers comprised of a metal, for example, tungsten as a main interconnection material, subsequently introducing an impurity, for example, boron (b) to the second conductor layer, then patterning the first and the second conductor layers thereby forming a conductor layer, and then forming a lower semiconductor layer comprised of, for example, polycrystal silicon for forming a semiconductor region for source and drain of load MISFET of SRAM so as to be in contact with the conductor layer.

Abstract: A low resistance Co silicide layer with less leakage current is formed over the surface of the source and drain of a MISFET by optimizing the film forming conditions and annealing conditions upon formation of Co (cobalt) silicide. Described specifically, low resistance source and drain (n+ type semiconductor regions, p+ type semiconductor regions) with less junction leakage current are formed by, upon formation of a Co silicide layer by heat treating a Co film deposited over the source and drain (n+ type semiconductor regions, p+ type semiconductor regions) of the MISFET, depositing the Co film at a temperature as low as 200° C. or less, carrying out heat treatment in three stages to convert the Co silicide layer from a dicobalt silicide (CO2Si) layer to a cobalt monosilicide (CoSi) layer and then to a cobalt disilicide (CoSi2) layer successively.