Patent ID: 7803246

Claim:
An etching system, comprising: an etching chamber comprising an exhaust port; a gas input pipe connected to the etching chamber, inputting etching process gas thereinto; a top RF electrode disposed above the etching chamber; a bottom RF electrode disposed under the etching chamber and opposite the top RF electrode, wherein the etching process gas is transformed into plasma by operation of the top and bottom RF electrodes; an exhaust pump connected to the exhaust port, expelling the plasma from the etching chamber; a base disposed in the etching chamber; wherein the exhaust port is at one lateral side of the base; a focus ring disposed on the base, accommodating a wafer, wherein the wafer is etched by the plasma; and a partial ring-shaped gas flow barricade disposed on the focus ring and near the lateral side of the exhaust port, regulating the plasma flowing through the wafer.