Patent ID: 7708860
Filing Date: 2010-05-04
Classification: H01J,H01L

Abstract:
1. A plasma processing apparatus, which performs a plasma process for the reverse face of a wafer for which an insulating sheet is adhered to the obverse face and which, for the plasma process, handles at least two sizes of wafer, a large wafer and a small wafer, comprising: an integrally formed electrode member, which is located in a process chamber that defines a closed space and which has a mounting face larger than a large wafer so that a wafer can be mounted while the insulating sheet is contacting the mounting face; a pressure reduction unit, for discharging a gas from the closed space to reduce pressure; a gas supply unit, for supplying a plasma generation gas to the closed space in which the pressure has been reduced; an opposing electrode, positioned opposite the electrode member; a plasma generator, for applying a high frequency voltage between the electrode member and the opposing electrode to set the plasma generation gas into a plasma state; a DC voltage application unit, for applying a DC voltage to the electrode member to electrostatically attract the wafer positioned on the mounting face; a cooling unit for cooling the electrode member; and a cover member, which has a ring shape and which is detachably covering outer portion of the mounting face, an inner diameter of the cover member being substantially equal to an outer diameter of the wafer placed on the mounting face, wherein the mounting face of the electrode member is divided into wherein a boundary between the first area and the first insulating area is designated inside the outer edge of the small wafer positioned in the center of the mounting face, a boundary between the first insulating area and the second area is designated outside the outer edge of the small wafer, and the first area and the first insulating area directly support the small wafer mounted on the insulating sheet, and wherein a boundary between the second area and the second insulating area is designated inside the outer edge of the large wafer positioned in the center of the mounting face, the second insulating area extends outward from the large wafer, and the first area, the first insulating area, the second area, and the second insulating area directly support the large wafer mounted on the insulating sheet.