Patent ID: 7691203
Filing Date: 2010-04-06
Classification: C23C,C30B

Abstract:
1. An apparatus for forming a film on a surface of a heated substrate by causing a plurality of source gases including at least a first source gas and a second source gas to react together, the apparatus comprising: a processing chamber in which the substrate is placed; the processing chamber divided into a heating chamber and a reaction chamber by at least the substrate so that the substrate surface can be exposed to the source gases in the reaction chamber; an exhaust duct through which the exhaust gas can be discharged and having a sectional area with a first radius from a central axis of the exhaust duct; the exhaust duct facing the exposed substrate surface and connecting with the reaction chamber; a first supply port and a second supply port through which the first and second source gases respectively can be supplied independently into the reaction chamber and onto the substrate surface; a placing region in which the substrate is placed, the sectional area of the exhaust duct is larger than an area of the substrate surface exposed in the reaction chamber as viewed along the central axis and having has a second radius from the central axis, the first and second supply ports positioned outside the radius of the sectional area of the exhaust duct taken from the central axis of the exhaust duct; the first and second source gases being blown toward the substrate surface from the first and second supply ports outside of the second radius taken from the central axis of the area of the exposed substrate surface, the apparatus further comprising a peripheral wall with a surface radially outside of and adjacent to locations where the first and second supply ports communicate with the reaction chamber and acting as a partition so as to confine the source gases within a radial space bounded by the peripheral wall surface to thereby reduce quantities of source gases that do not function effectively in the reaction chamber; and an annular member having a top end and a bottom end with a surface that forms a part of the reaction chamber, the surface of the annular member widening from its bottom end towards its top end in the direction of the substrate and bounding the reaction chamber in conjunction with the surface of the peripheral wall that is located between the top and bottom ends of the annular member, the annular member connecting with the exhaust duct, the first and second supply ports each formed through the surface of the annular member, the surfaces of the annular and peripheral walls defining a solid, annular partition that radially confines the first and second gases from the first and second supply ports at the reaction chamber wherein the annular member and a part of the exhaust duct are part of an annular box, the annular box residing radially outside of the sectional area of the exhaust duct, the reaction chamber defined radially inside the annular box, the first and second supply ports each formed in the annular box.