Patent ID: 7968439

Claim:
A method of performing plasma immersion ion implantation on a semiconductor workpiece in a plasma reactor chamber, comprising: prior to introducing the workpiece into the reactor, depositing a partially conductive seasoning film on interior surfaces of said chamber, said seasoning film comprising silicon, oxygen and hydrogen and having a silicon content of between 70% and 85%; electrostatically clamping the workpiece on a workpiece support surface in the reactor chamber by applying an electrostatic clamping voltage to an electrode underlying and insulated from the workpiece support surface; generating a plasma in the chamber from a process gas containing species to be ion implanted in the workpiece by coupling RF plasma source power from an RF source power generator to said process gas; applying RF bias power from an RF bias power generator to a disk-shaped electrode underlying and insulated from the workpiece and having a circumferential edge underlying a circumferential edge of the workpiece, said RF bias power being sufficient to produce a high RF bias voltage on the workpiece on the order of 5-20 kV corresponding to a desired ion implantation depth profile below the surface of said workpiece of said species to be implanted, wherein said electrostatic clamping voltage is on the order of or exceeds a D.C. component of said RF bias voltage; and removing said workpiece by turning off said clamping voltage, waiting for electrical discharge of said workpiece through a portion of said seasoning film covering said workpiece support surface, and thereafter lifting said workpiece from said workpiece support surface.