Patent ID: 8016975

Claim:
An etching system, comprising: an etching chamber comprising a plurality of exhaust ports; 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 ports, expelling the plasma from the etching chamber, wherein the exhaust ports are lateral to the base; a base disposed in the etching chamber; a focus ring disposed on the base, accommodating a wafer, wherein the wafer is etched by the plasma; and a plurality of partial ring-shaped flow barricades disposed on the focus ring and separated from each other, wherein each of the plurality of the barricades respectively correspond to and near each of the exhaust ports, regulating the plasma flowing through the wafer.