Patent ID: 8093142

Claim:
A plasma processing device comprising: a reaction chamber; a gas introducing portion that introduces a reactant gas into the reaction chamber; an exhaust unit that discharges the reactant gas from the reaction chamber; a first electrode and a second electrode supported in the reaction chamber and having a flat-plate shape; and a first supporting member and a second supporting member that support the first and second electrodes such that the electrodes face each other, wherein maximum deflection amounts of the first and second electrodes, which are maximum sinking distances under their own weights, in a state where the first and second electrodes are supported by the first and second supporting members, are adapted to be equal to each other, and wherein the first and second electrodes are distant from each other by a predetermined inter-electrode distance, and wherein the shapes, sizes, and materials of the first and second electrodes are adapted in such a manner that maximum deflection amounts thereof are at least 1% of the inter-electrode distance, and wherein the first and second electrodes are subjected to an annealing process, and wherein the thickness of the first and second electrodes are set in a range of 10 to 50 mm.