Patent ID: 6852168

Claim:
A thin film deposition reactor comprising: a reactor block on which a wafer is placed; a shower head plate for uniformly maintaining a predetermined pressure by covering the reactor block; a wafer block installed in the reactor block, on which the wafer is to be seated; an exhausting portion connected to the reactor block for exhausting a gas from the reactor block; a first connection line in communication with the shower head plate for supplying a first reaction gas and an inert gas; a second connection line in communication with the shower head plate for supplying a second reaction gas and the inert gas; a diffusion plate mounted on a lower surface of the shower head plate, the diffusion plate having a plurality of spray holes which is in communication with the first connection line and face the upper surface of the wafer to spray the first reaction gas and the inert gas onto the wafer, and a plurality of nozzles which is in communication with a passage radially formed from the second connection line and extend toward the inner side surface of the reactor block to spray the second reaction gas and the inert gas toward edges of the wafer, whereby the first and second reaction gases are applied on the wafer without mixing each other; and a second mixing portion between the second connection line and the shower head plate for mixing the second reaction gas and the inert gas supplied from the second connection line and diffusing the mixture to the nozzles through the passage, the second mixing portion having an auxiliary diffusion plate in which holes are formed.