Patent ID: 8197637

Claim:
A semiconductor fabrication apparatus to perform semiconductor etching and deposition processes, the apparatus comprising: a lower body having lower and middle electrodes, the lower and middle electrodes having a same center and a diameter of the lower electrode being larger than a diameter of the middle electrode; and an upper body disposed on the lower body and comprising an upper electrode, gas tubes disposed on the upper electrode and a gas induction housing, the upper electrode and the gas induction housing having the same center and a diameter of the upper electrode being larger than a diameter of the gas induction housing, wherein the upper, middle and lower electrodes are electrically connected to one another, the gas induction housing and the middle electrode protrude from the upper and lower electrodes to face each other, and intensity of an electrical field among the upper, middle and lower electrodes gradually decreases toward an edge between the gas induction housing and the middle electrode from an edge between the upper electrode and the lower electrode, wherein the gas induction housing has a strip-shaped gas inducer along a sidewall of the induction housing and gas holes facing the middle electrode, one of the gas tubes is in communication with the gas holes through the upper electrode and the gas induction housing, and an other gas tube is in communication with the gas inducer through the upper electrode and the gas induction housing.