Substrate processing apparatus including improved exhaust structure

Abstract

A substrate processing apparatus unit is disclosed. Exemplary substrate processing apparatus includes a reaction chamber provided with a reaction space; a susceptor disposed in the reaction chamber and configured to support a substrate, wherein the susceptor is configured to be vertically movable between a process position and a transfer position; a shower plate provided above the susceptor and configured to provide the reaction space with a gas; a gas exhaust unit configured to exhaust the gas from the reaction chamber, comprising: an exhaust duct surrounds the shower plate and provided with a main duct; a first flow control ring that surrounds the susceptor with a space when the susceptor is in the process position; and a second flow control ring surrounds the first flow control ring; wherein a first exhaust channel is formed between the exhaust duct and the first flow control ring; wherein a second exhaust channel is formed between the first flow control ring and the second control ring, and the second exhaust channel is fluidly connected to the main duct and an area below the susceptor.

Dependencies are inferred from the claim text.