Phase-resolved measurements of ion velocity in a radio-frequency sheath.
The time-dependent argon-ion velocity distribution function above and within the plasma sheath of an rf-biased substrate has been measured using laser-induced fluorescence in a commercial plasma processing tool. Discharge parameters were such that the 2.2 MHz rf-bias period was on the order of the ion transit time through the sheath (τ{ion}/τ{rf}=0.3). This work embodies the first time-resolved measurement of ion velocity distribution functions within an rf-biased sheath over a large area (30 cm diameter) silicon wafer substrate.
Jacobs
Brett
B
Department of Physics and Astronomy, University of California-Los Angeles, Los Angeles, California 90024, USA.
Gekelman
Walter
W
Pribyl
Pat
P
Barnes
Michael
M