Patent ID: 7479303

Claim:
A method of chemical vapor deposition (CVD) comprising: providing a showerhead through which a source material gas including a reactive gas of at least one kind and a purge gas is injected over a substrate located in a reaction chamber to deposit a film on the substrate, wherein the showerhead has a plurality of reactive gas outlets and each is surrounded by a corresponding purge gas outlet; disposing the showerhead in such a way that the bottom surface of the showerhead is spaced apart from the substrate by a predetermined distance; supplying a reactive gas of the source material gas into the showerhead, wherein reactive gases of different kinds are injected into compartments formed inside the showerhead so that each compartment of the showerhead is filled with the reactive gas of only one kind and a purge gas of the source material gas is supplied into another compartment formed inside the showerhead; and discharging the reactive gas and the purge gas through the plurality of reactive gas outlets and the plurality of purge gas outlets formed on the bottom surface of the showerhead wherein the reactive gas is discharged from the individual reactive gas outlets and the discharged reactive gas is surrounded by discharged purge gas, and further wherein the discharged reactive gas and purge gas are discharged in the same direction toward the substrate.