Patent ID: 8202809

Claim:
A method of manufacturing a semiconductor device, comprising: (a) supplying a source gas containing a predetermined element to a heated substrate in a process vessel to form a layer containing the predetermined element on the substrate; (b) supplying an oxygen-containing gas and a hydrogen-containing gas to the heated substrate in the process vessel to change the layer containing the predetermined element into an oxide layer, wherein a pressure of an inside of the process vessel is lower than an atmospheric pressure; (c) supplying an inert gas into the process vessel to purge the inside of the process vessel; and (d) alternately repeating the step (a) and the step (b) to form an oxide film having a predetermined thickness wherein the step (c) is performed between the step (a) and the step (b); wherein, in the step (a), the source gas is supplied toward the substrate through a nozzle disposed at a side of the substrate, and one of the inert gas and the hydrogen-containing gas is supplied together with the source gas through the nozzle toward the substrate such that a flow velocity of the source gas flowing parallel to a surface of the substrate is greater than a flow velocity of the inert gas flowing parallel to the surface of the substrate in the step (c).