Patent ID: 9177839
Filing Date: 2015-11-03
Classification: C23C,H01J,H01L

Abstract:
1. A substrate processing apparatus for plasma etching a substrate comprising: a processing chamber that accommodates the substrate; a processing gas diffusing and supplying unit serving as a showerhead that supplies a processing gas to the processing chamber; a susceptor serving as a lower electrode configured to mount the substrate; at least one processing gas introducing pipe that introduces the processing gas into the processing gas diffusing and supplying unit; and a gas exhaust pipe connected to a gas exhaust unit that performs vacuum exhaust of the processing chamber, wherein the processing gas diffusing and supplying unit includes, a supporting portion having an opening, a plate including gas supply holes, an internal space formed by the supporting portion and the plate, the internal space communicating with the opening, and directly communicating with the gas supply holes, a cover part installed within the internal space and attached to the supporting portion, wherein the cover part includes, a shielding portion which is disposed within the internal space and has a surface facing the opening, a side wall formed from a cylinder shaped member and which holds the shielding portion, the diameter of the cylinder shaped member and the shielding portion being the same, and a through hole formed at the side wall and communicating with the opening and the internal space, wherein at least a portion of the gas supply holes is located right below the cover part and a height of the internal space is equal to or greater than 8 mm so that the processing gas discharged from the through hole is diffused to the internal space and is uniformly supplied through the gas supply holes, and wherein the internal space is in the shape of a rectangular parallelopipedon, the height of the rectangular parallelopipedon is ε, a width of the rectangular parallelopipedon is ω, a length of a space defined by a plane (i) and a plane (i−1) in the rectangular parallelopipedon is L, where the plane (i) and the plane (i−1) are perpendicular to a length direction of the rectangular parallelopipedon, pressures exerted on the plane (i) and the plane (i−1) are P a flow rate Q