Patent ID: 8105647

Claim:
A method of forming an oxide film on substrates, comprising: placing a plurality of substrates on a substrate mounting unit in a reaction space; and supplying a process gas onto the substrates through a gas injector with a plurality of injection parts that are adapted to rotate over the substrates, wherein supplying the process gas includes: supplying a silicon-containing gas comprising at least one of SiH 4 , Si 2 H 6 , Si 3 H 8 , TEOS, DCS, HCD and TSA through a first injection part of the gas injector; supplying a purge gas through a second injection part of the gas injector; supplying a reaction gas comprising at least one of O 2 , N 2 O, O 3 , H 2 O and H 2 O 2 through a third injection part of the gas injector; supplying a purge gas through a fourth injection part of the gas injector; and allowing the first to fourth injection parts to pass the substrates sequentially, wherein the first to fourth injection parts are sequentially arranged in a clockwise direction, and wherein a first distance in a clockwise direction from the first injection part for supplying the silicon-containing gas to the second injection part, and a second distance in a counterclockwise direction from the first injection part to the fourth injection part are shorter than a third distance in a counterclockwise direction from the third injection part for supplying the reaction gas to the second injection part, and a fourth distance in a clockwise direction from the third injection part to the fourth injection part.