Patent ID: 8069817

Claim:
A showerhead electrode assembly for a semiconductor material processing apparatus, comprising: a top plate including a bottom surface, a first gas passage adapted to be in fluid communication with a process gas supply section and a heating gas supply section, and a second gas passage adapted to be in fluid communication with a heat transfer gas supply section; and a showerhead electrode of semiconductor material separate and distinct from the top plate, the showerhead electrode comprising a top electrode and a bottom electrode, the showerhead electrode being flexibly suspended from the top plate, the showerhead electrode comprising a top surface, an entirety of said top surface being spaced from the bottom surface of the top plate by a gap in fluid communication with the second gas passage but not with the first gas passage, a plasma-exposed bottom surface including gas holes, and a gas manifold in fluid communication with the first gas passage and the gas holes but not with the second gas passage.