Patent ID: 11972932
Assignee: ULVAC, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 0:
1. A deposition method, comprising:
by using a deposition apparatus including
a first electrode that includes a sputtering target,
a second electrode that faces the first electrode and is capable of supporting a substrate,
a first power supply source that includes a first high-frequency power source and a first matching circuit, the first high-frequency power source outputting first high-frequency power, the first matching circuit being connected between the first high-frequency power source and the first electrode,
a second power supply source that includes a second high-frequency power source and a second matching circuit, the second high-frequency power source outputting second high-frequency power that has the same period as the first high-frequency power and is lower than the first high-frequency power, the second matching circuit being connected between the second high-frequency power source and the second electrode and the second matching circuit including an input terminal, an output terminal, a first variable capacitor, and a second variable capacitor, the input terminal being connected to the second high-frequency power source, the output terminal being connected to the second electrode, the first variable capacitor being connected between the input terminal and a ground potential, the second variable capacitor being connected between the input terminal and the output terminal in series, and
a phase adjuster that adjusts a phase of the first high-frequency power that is output from the first high-frequency power source and input to the first matching circuit and a phase of the second high-frequency power that is output from the second high-frequency power source and input to the second matching circuit,

causing the first high-frequency power source to output the first high-frequency power to form discharge plasma between the first electrode and the second electrode;
causing the second high-frequency power source to output the second high-frequency power and causing the phase adjuster to operate to provide a phase difference θ between the phase of the first high-frequency power and the phase of the second high-frequency power;
detecting a voltage value Vpp of the second high-frequency power and a capacitance value C1 of the first variable capacitor that correspond to the phase difference θ in a state where output impedance of the second high-frequency power source and load-side impedance connected to the second high-frequency power source match;
forming the phase difference θ by delaying the phase of the second high-frequency power with respect to the phase of the first high-frequency power;
obtaining a profile curve of the voltage value Vpp and a profile curve of the capacitance value C1 that correspond to the phase difference θ by changing the phase difference θ; and
forming a sputtering film on the substrate in a state where the output impedance and the load-side impedance match by setting the phase difference θ in a first range of the profile curve of the voltage value Vpp or a second range and selecting the voltage value Vpp and the capacitance value C1 in combination, the first range being a range of +30 degrees to +50 degrees from a phase difference θ1 of the profile curve of the voltage value Vpp where the voltage value Vpp is the lowest, the second range being a range of +10 degrees to −10 degrees from a phase difference θ2 where the voltage value Vpp is the largest.