Patent ID: 8882913

Claim:
An apparatus for chemical vapor deposition (CVD) with a showerhead through which a reactive gas and a purge gas are injected over a substrate located in a reaction chamber to deposit a film on the substrate, the showerhead comprising: a reactive gas showerhead module, equipped with a reactive gas supply port to supply the reactive gas to the inside of the reactive gas showerhead module, having a plurality of reactive gas injection tubes connected to a bottom of the reactive gas showerhead module to inject the reactive gas over the substrate through the reactive gas injection tubes; a purge gas showerhead module, disposed below the reactive gas showerhead module, the purge gas showerhead module comprising a ceiling, a vertical wall, and a bottom plate, and equipped with a purge gas supply port to supply the purge gas to the inside of the purge gas showerhead module, the purge gas showerhead module having a plurality of guide tubes hermetically installed and extending between the ceiling and the bottom plate of the purge gas showerhead module and allowing the reactive gas injection tubes to pass through the guide tubes of the purge gas showerhead module while keeping a hermetic sealing between the purge gas showerhead module and the reactive gas injection tubes; and a cooling jacket for cooling the showerhead, the cooling jacket mounted below the purge gas showerhead module, the cooling jacket comprising a ceiling, a vertical wall, a coolant inlet port, a coolant outlet port, and a bottom, wherein said ceiling of the cooling jacket is a different element from the bottom plate of the purge gas showerhead module, and a plurality of guide tubes hermetically installed and extending between the ceiling and the bottom of the cooling jacket, with one end of each guide tube connected to the ceiling of the cooling jacket and the other end connected to the bottom of the cooling jacket, said guide tubes aligned with the guide tubes of the purge gas showerhead module and configured to receive the reactive gas injection tubes there-through, the inner diameter of the guide tubes being larger than the outer diameter of the reactive gas injection tubes and having a gap between the guide tube and the reactive gas injection tube, wherein the showerhead is configured such that the purge gas released from the purge gas showerhead module passes through the gap between the guide tube and the reactive gas injection tube to be injected over the substrate.