Patent ID: 8506710

Claim:
An apparatus for fabricating a semiconductor device comprising: a chamber having a sidewall; a susceptor in the chamber; a plurality of injection holes in the sidewall, the plurality of injection holes disposed along a horizontal direction and arranged in a single row, each of the plurality of injection holes in direct communication with the chamber; a plurality of exhaust holes in the sidewall, the plurality of exhaust holes disposed along the horizontal direction and facing the plurality of injection holes with the susceptor therebetween, wherein the plurality of exhaust holes are arranged in a single row; one first buffer cavity having a bent portion, one end of the one first buffer cavity connected to the plurality of injection holes; one inlet pipe connected to the other end of the one first buffer cavity; a second buffer cavity having a U-shape, one end of the second buffer cavity connected to the plurality of exhaust holes; and an outlet pipe connected to the other end of the second buffer cavity, wherein the one first buffer cavity has the bent portion therein to diffuse reaction gases in the one first buffer cavity and to change a flow path of the reaction gases, wherein the second buffer cavity has the U-shape therein to concentrate the reaction gases in the second buffer cavity and to change the flow path of the reaction gases.