Patent ID: 8414985

Claim:
A method comprising: introducing a process gas in a reaction chamber of a plasma deposition device, the reaction chamber including a first electrode installed at the top of the reaction chamber inside a reaction space of the reaction chamber and a second electrode installed at the bottom of the reaction chamber inside the reaction space, wherein a substrate is positioned on the second electrode; supplying, from a first power source only to the first electrode, a first pulsed signal with a first duty cycle and a first frequency; and supplying, from a second power source only to the second electrode, a second pulsed signal with a second duty cycle and a second frequency, the first frequency being different than the second frequency; wherein the first pulsed signal and the second pulsed signal are supplied having an overlap portion during which a portion of a period during which the first pulsed signal is in an on state overlaps a portion of a period during which the second pulsed signal is in an on state.