Patent ID: 8888949
Filing Date: 2014-11-18
Classification: C23C,H01J,H01L

Abstract:
1. A gas distribution apparatus used for a plasma processing equipment, comprising a horizontally arranged support plate which is fixedly connected to a top electrode of the plasma processing equipment, a first air inlet passage is provided at a central position of the support plate; a showerhead electrode, which is parallel to the support plate, is fixedly connected below the support plate, a first gas distribution plate is horizontally arranged in a chamber between the support plate and the showerhead electrode, and the first gas distribution plate has a plurality of axial viahole; a central position of the first gas distribution plate is corresponding to the central position of the support plate; wherein a plurality of circumferential gas-flow grooves surrounding the central position of the first gas distribution plate and a plurality of radial gas-flow grooves communicating with the plurality of circumferential gas-flow grooves, are arranged on an upper surface of the gas distribution plate; the plurality of axial viahole are arranged in a plurality of the at least one circumferential gas-flow grooves and the plurality of radial gas-flow grooves; the plurality of radial gas-flow grooves being uniformly distributed, and a width of a respective one of the plurality of radial gas-flow grooves being gradually reduced outwards along a radial direction of the first gas distribution plate; and a width of a respective one of the plurality of circumferential gas-flow grooves successively increasing outwards along the radial direction of the first gas distribution plate.