Patent ID: 8366827

Claim:
An apparatus for processing a substrate, comprising: a chamber including the substrate to be processed with a received source gas, the chamber including a gateway through which the substrate passes and an exhaust hole through which inner gases are exhausted; a stage on which the substrate is positioned in the chamber; and a chamber insert including, a cylindrical body portion including an open top end portion and an open bottom end portion, the cylindrical body portion including a slit and at least one hole, the slit and the at least one hole positioned circumferentially along the cylindrical body portion, a first protruding portion extending outwardly from a first portion of the cylindrical body portion; and a second protruding portion extending outwardly from a second portion of the cylindrical body portion, wherein the slit is positioned at a side surface of the cylindrical body portion so as to circumferentially correspond to the second protruding portion, and the at least one hole is formed in a position along the cylindrical body portion not circumferentially corresponding to a position of the slit formed in the cylindrical body portion, thereby reducing an amount of gas discharged/outflowed through the slit, and the cylindrical body has an asymmetrical shallow cylinder shape, the first portion of the cylindrical body opposite to the second portion has a first radius of curvature and the second portion has a second radius of curvature smaller than the first radius of curvature, and wherein the gateway and the exhaust hole are formed at different side surfaces of the chamber, and wherein the chamber insert is spaced apart from a first sidewall of the chamber including the exhaust hole by a first distance and from a second sidewall of the chamber including the gateway by a second distance, the second distance being greater than the first distance.