Patent ID: 8679253

Claim:
A deposition apparatus, comprising: a reaction chamber for deposition; a gas supplying system for supplying a first gas and a second gas into said reaction chamber, comprising: a first supply line being connected at a first point to said reaction chamber for supplying said first gas in said reaction chamber; a second supply line, including a first line connected to said reaction chamber at a second point for supplying said second gas into said reaction chamber and a second line branched from said first line and connected to said first supply line; a switching unit for switching between a supply of said first gas to said reaction chamber in a first step in which said first gas and said second gas are supplied into said reaction chamber and a stopping of the supply of said first gas to said reaction chamber in a second step in which said second gas is selectively supplied into said reaction chamber, comprising: a first valve located on said first supply line between the supply of said first gas and the second line's connection to said first supply line; a second valve located on said second supply line between the branched second line and said reaction chamber; and a third valve located on said second line between said first supply line and said second supply line; an exciting unit for exciting a gas being supplied into said reaction chamber to create a plasma; a controller unit configured to control: said exciting unit, so that an excitation of the gas into a plasma is not performed by said exciting unit during said first step in which said first gas is adsorbed on a substrate to form a deposition layer while having said second gas being employed as a carrier gas and an excitation of the gas into a plasma is performed by said exciting unit during said second step in which said second gas, with being excited into a plasma, treats said deposition layer; and said switching unit to switch between the supply of said first gas to said reaction chamber in said first step in which said first gas and said second gas are supplied into said reaction chamber and stopping the supply of said first gas to said reaction chamber in said second step in which said second gas is selectively supplied into said reaction chamber, wherein said second gas is selectively supplied into said reaction chamber by closing said first valve and supplying said second gas via said first supply line by closing the second valve and opening the third valve and supplying the second gas via the first line of the second supply line by opening the second valve and closing the third valve.