Patent ID: 8808454

Claim:
A chemical vapor deposition apparatus comprising: a processing chamber; a susceptor capable of being loaded with a substrate thereon inside the processing chamber; a gas injection unit injecting a processing gas into an inside of the processing chamber, the gas injection unit comprising: a gas distribution housing; a cooling housing positioned between the gas distribution housing and a processing chamber where a deposition process is performed, wherein the cooling housing is formed with a coolant inlet through which coolant is introduced and a coolant outlet through which the coolant is discharged; a processing gas pipe having one end opened to the gas distribution housing and the other end opened to the processing chamber, wherein the processing gas pipe is formed to penetrate therethrough a portion of the cooling housing; a first wall part positioned inside the cooling housing so as to partition the cooling housing into a central path and an annular shaped peripheral path, wherein the first wall part is formed with a plurality of penetration holes providing a path between the central path and the annular shaped peripheral path and, a second wall part formed in an outer side of the first wall part at an approximately mid portion of the coolant inlet and the coolant outlet to substantially equally partition the annular shaped peripheral path into (a) an annular shaped first peripheral path bounded at least in part by an interior surface of a sidewall and the outer side of the first wall part, wherein the coolant inlet is located within the annular shaped first peripheral path, and (b) an annular shaped second peripheral path bounded at least in part by the interior surface of the sidewall and the outer side of the first wall part, wherein the coolant outlet is located within the annular shaped second peripheral path, such that coolant is introduced into the annular shaped first peripheral path from the coolant inlet and discharged out of the annular shaped second peripheral path from the coolant outlet, wherein the second wall part is positioned in the annular shaped peripheral path such that the coolant introduced from the coolant inlet is substantially prevented from discharging to the coolant outlet without being introduced into the central path; wherein a portion of the plurality of penetration holes forms a connecting path through which the coolant is introduced from the annular shaped first peripheral path into the central path and the remaining portion of the plurality of penetration holes forms a connecting path through which the coolant is exited from the central path into the annular shaped second peripheral path so as to be discharged.