Patent ID: 9478387
Filing Date: 2016-10-25
CPC Classification: H01J

Claim Text:
1. A plasma processing apparatus comprising: an evacuable processing chamber for accommodating a target substrate having thereon an oxide film and an organic film and for loading/unloading the substrate; a processing gas supply unit for supplying a processing gas into the processing chamber; a plasma generation unit for generating plasma of the processing gas within the processing chamber; a first electrode for mounting and holding the substrate thereon within the processing chamber; a first high frequency power supply unit for applying to the first electrode a first high frequency power having a first frequency in order to attract ions from the plasma toward the substrate on the first electrode; a second high frequency power supply unit for applying to the first electrode a second high frequency power having a second frequency higher than the first frequency in order to attract ions from the plasma toward the substrate on the first electrode; and a control unit configured to control a minimum energy and a maximum energy of the ions incident onto the substrate independently of each other such that ion energy of the ions are concentrated at a first energy band and a second energy band respectively, wherein the oxide film is etched using the organic film as a mask to form a hole within the oxide film by the plasma, the first energy band is lower than a first energy value at which the oxide film is etched while the organic film is not etched, and the second energy band is higher than a second energy value at which an etching yield at an inclined surface of the hole is higher than an etching yield of an upper surface of the organic film.