Patent ID: 7931749

Claim:
A showerhead that supplies a source gas and a supporting gas into a vacuum atmosphere in a processing vessel, so as to deposit a film on a surface of an object to be processed in the processing vessel, comprising: a showerhead body provided with a gas jetting surface facing an inside of the processing vessel; a first diffusion chamber formed in the showerhead body to receive the source gas and diffuse the same; a second diffusion chamber formed in the showerhead body to receive the supporting gas and diffuse the same; a plurality of source-gas jetting orifices formed in the gas jetting surface to be communicated with the first diffusion chamber; a plurality of first supporting-gas jetting orifices formed in the gas jetting surface to be communicated with the second diffusion chamber; and a plurality of second supporting-gas jetting orifices formed in the gas jetting surface to be communicated with the second diffusion chamber, wherein each of the first supporting-gas jetting orifices has a ring shape that adjacently surrounds a corresponding one of the source-gas jetting orifices, and each of the source-gas jetting orifices is positioned inside the ring of the first supporting-gas jetting orifice, and each of the second supporting-gas jetting orifices is arranged between adjacent two of the source-gas jetting orifices.