Patent ID: 6663714
Filing Date: 2003-12-16
Classification: C23C,H01L,Y10S

Abstract:
A CVD apparatus for forming a thin film on a substrate, the apparatus comprising:a heating holder for the substrate provided in a reduced pressure vessel, a ring chuck for fixing the substrate and having the function of preventing a raw material gas and a secondary product gas from spreading to the back surface of the substrate, a gas introducing section provided opposed to the substrate for introducing the raw material gas, a support member provided on side walls of the reduced pressure vessel to hold the ring chuck, an interior of the reduced pressure vessel being divided into upper and lower portions by the ring chuck, the support member and the substrate, an inner wall provided to connect a roof plate of the vessel and the support member to each other and to further divide the upper portion into a deposition chamber and an exhaust chamber, a transfer chamber provided in the lower portion for substrate transfer, both of the deposition chamber and the exhaust chamber being formed in axial symmetry around the same central axis and communicated to each other by holes provided in the inner wall, and the deposition chamber and the transfer chamber being communicated to each other by a gap formed between the ring chuck and the support member, a first purge gas introducing section provided in the transfer chamber so that the first purge gas is made to flow into the deposition chamber from the transfer chamber, and a plurality of supply passages for the first purge gas provided inside the heating holder so that the first purge gas is blown off into the transfer chamber in an axially symmetrical manner, wherein the ring chuck fixes the substrate to a surface of the heating holder.