Patent ID: 7886687

Claim:
A plasma processing apparatus for generating plasma in a chamber maintained in a vacuum state and processing a substrate using the plasma, the apparatus comprising: upper and lower electrodes respectively provided in upper and lower portions of the chamber for applying high-frequency power into the chamber, wherein the upper electrode comprises a plate portion and a protrusion portion that extends downward from an outer peripheral edge portion of the plate portion; a shower head connected to a lower end of the protrusion portion of the upper electrode such that a space is formed between an upper surface of the shower head and a lower surface of the plate portion of the upper electrode, wherein the shower head diffuses a process gas into the chamber; a refrigerant channel formed within the shower head and extending in horizontal direction, wherein the refrigerant channel guides refrigerant through the shower head; and a refrigerant circulating unit connected to both a supply end and a collection end of the refrigerant channel so as to supply refrigerant through the supply end of the refrigerant channel and collect refrigerant at the collection end of the refrigerant channel to circulate refrigerant through the shower head, wherein a groove is carved in a surface of the shower head facing the upper electrode, at a position where the refrigerant channel is not formed, and a plurality of holes is formed in the groove, extending downward from a lower surface of the groove to a lower surface of the shower head such that process gas is diffused into the chamber through the plurality of holes.