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Plasma uniformity in high-density inductively coupled plasma tools

R A Stewart, P Vitello, D B Graves, E F Jaeger and L A Berry

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A two-dimensional (r, z) fluid model is used to study plasma transport in inductively coupled plasmas (ICPS). Electron heating from external RF coil driven at 2 MHz is calculated self-consistently by solving for the time-averaged RF electric field. Radial plasma uniformity has been studied in both high (R/L=2.5) and low (R/L=1) aspect ratio ICP reactors driven with external planar or cylindrical coils. The effect of neutral gas pressure on plasma uniformity is presented for Ar discharges at 5 and 20 mTorr. The location of external coils and corresponding power deposition profile is predicted to have little effect on uniformity except at higher pressure (>or approximately= 20 mTorr) and for large aspect ratios. Planar coils appear superior to cylindrical coils for achieving relatively consistent uniformity over a wide range of pressures and reactor aspect ratios.


PACS

52.30.Ex Two-fluid and multi-fluid plasmas

52.25.Fi Transport properties

52.50.Qt Plasma heating by radio-frequency fields; ICR, ICP, helicons

52.80.-s Electric discharges

52.65.Kj Magnetohydrodynamic and fluid equation

Subjects

Plasma physics

Dates

Issue 1 (February 1995)



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