Patent ID: 8617349
Filing Date: 2013-12-31
Classification: C23C,H01J,Y10T

Abstract:
1. A showerhead assembly for a plasma process apparatus for processing substrates, comprising: a top plate having gas inlet; a perforated plate positioned below the top plate and distanced from the top plate so as to define an upper gas compartment with the top plate; a gas distribution plate positioned below the perforated plate and distanced from the perforated plate so as to define a lower gas compartment, the gas distribution plate facing the substrate to be processed; and, wherein the gas distribution plate comprises a plurality of elongated gas distribution slots on its lower surface and a plurality of gas distribution holes on its upper surface, each of the gas distribution holes having a diameter larger than holes in the perforated plate, and each of the gas distribution holes making fluid connection from the lower gas compartment to more than one of the gas distribution slots.