Patent ID: 9017535
Filing Date: 2015-04-28
Classification: C23C,H01J,H01L

Abstract:
1. A high-frequency sputtering device comprising: a chamber; a gas evacuation unit that evacuates an inside atmosphere of the chamber; a gas supply unit that supplies a gas into the chamber; a substrate holder having a floating potential and provided with a substrate mounting surface for mounting a substrate; a sputtering cathode provided with a target mounting table for sputtering an insulator target on the target mounting table by applying a high-frequency power to the gas to generate a plasma of the gas; an electrode disposed inside the substrate holder and extending along the substrate mounting surface; a variable impedance for adjusting a substrate potential, one end of the variable impedance being electrically connected to the electrode and another end of the variable impedance being grounded; an inflow-electron detection sensor disposed inside the substrate holder and exposed to a space in which the plasma is generated through an opening formed on the substrate holder; an arithmetic circuit configured to derive a potential of the substrate on the basis of DC level in a current from the inflow-electron detection sensor; and a control circuit configured to control the variable impedance so that the substrate potential is within a predetermined range according to the derived substrate potential, wherein a part of the electrode at the opening forms the inflow-electron detection sensor, and wherein the substrate holder is not electrically connected to a high-frequency power supply.