Patent ID: 7273526
Filing Date: 2007-09-25
Classification: C23C

Abstract:
1. A gas-feeding apparatus connected to an evacuatable reaction chamber provided with a support for placing a substrate thereon, a gas-distribution head for introducing gases into the chamber through a head surface, comprising: a first plate having exclusively a first flow channel for discharging a first gas therein through the first flow channel and the head surface toward the support; and a second plate constituting the head surface and an exhaust path and disposed under the first plate, said second plate having both the first flow channel and a second flow channel which is for discharging a second gas through the second flow channel and the head surface toward the support, wherein there is no gas-mixing between the first flow channel and the second flow channel, said exhaust path is coupled to an exhaust system for purging therefrom a gas present in the corresponding flow channel without passing through the head surface, said first and second plates being stratified parallel to each other in a direction perpendicular to their axial direction and being overlapped as viewed in the axial direction, said second plate being closer to the head surface than is the first plate.