Patent ID: 8431035
Filing Date: 2013-04-30
Classification: H01J

Abstract:
1. A plasma processing method, comprising the steps of: mounting a substrate on a lower electrode disposed to face an upper electrode in a processing chamber; supplying a first radio frequency power to the lower electrode to thereby generate a plasma between the lower and the upper electrode; supplying a second radio frequency power to the lower electrode to attract ions of the plasma to the substrate, wherein a frequency of the second radio frequency power is lower than a frequency of the first radio frequency power; and processing the substrate by using the plasma, wherein an impedance of a first circuit at the side of the upper electrode seen from the plasma for the frequency of the first radio frequency power is adjusted by an electrical characteristic control unit such that the first circuit does not resonate and a reactance of a second circuit at the side of the upper electrode from a surface of the upper electrode facing the plasma is adjusted to have a negative value by the electrical characteristic control unit while processing the substrate by using the plasma to thereby improve an in-surface uniformity in plasma processing, wherein the first circuit includes the upper electrode, the electrical characteristic control unit, and a sheath region formed between the upper electrode and the plasma, and the second circuit includes the upper electrode and the electrical characteristic control unit.