Patent ID: 8664627
Filing Date: 2014-03-04
Classification: C23C,F17D,Y10T

Abstract:
1. A method for supplying gas over a substrate in a reaction chamber wherein a substrate is placed on a pedestal, said reaction chamber having a gas-ejecting periphery on a plane, from which gas is ejected, said method comprising: supplying a first gas from the gas-ejecting periphery from a first side of the reaction chamber to a second side of the reaction chamber opposite to the first side in a horizontal direction passing through an axis of the reaction chamber so that the first gas travels over the substrate in a main stream from a first side of the substrate to a second side of the substrate opposite to the first side in a horizontal direction passing across a center of the substrate; and supplying a second gas from the gas-ejecting periphery from sides of the reaction chamber other than the first side of the reaction chamber toward the main stream, wherein the first gas and the second gas are the same gas which is ejected in three or more directions, unevenly with respect to the gas-ejecting periphery, so that the second gas travels over the substrate in auxiliary streams from sides of the substrate other than the first side in a downstream direction of the main stream, said main stream being predominant relative to said auxiliary streams.