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  4. "sensArray" voltage sensor analysis in an inductively coupled plasma
 
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"sensArray" voltage sensor analysis in an inductively coupled plasma

Journal
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Journal Volume
28
Journal Issue
1
Pages
139-146
Date Issued
2010
Author(s)
Titus M.J.
Hsu C.C.  
Graves D.B.
DOI
10.1116/1.3268615
URI
https://scholars.lib.ntu.edu.tw/handle/123456789/409108
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-73849146418&doi=10.1116%2f1.3268615&partnerID=40&md5=36d1a3de20a03bade028ce73c27695ca
Abstract
A commercially manufactured PlasmaVoltTM sensor wafer was studied in an inductively coupled plasma reactor in an effort to validate sensor measurements. A pure Ar plasma at various powers (25-420 W), for a range of pressures (10-80 mT), and bias voltages (0-250 V) was utilized. A numerical sheath simulation was simultaneously developed in order to interpret experimental results. It was found that PlasmaVoltTM sensor measurements are proportional to the rf-current through the sheath. Under conditions such that the sheath impedance is dominantly capacitive, sensor measurements follow a scaling law derived from the inhomogeneous sheath model of Lieberman and Lichtenberg, [Principles of Plasma Discharges and Materials Processing (Wiley, New York, 2005)]. Under these conditions, sensor measurements are proportional to the square root of the plasma density at the plasma-sheath interface, the one-fourth root of the electron temperature, and the one-fourth root of the rf bias voltage. When the sheath impedance becomes increasingly resistive, the sensor measurements deviate from the scaling law and tend to be directly proportional to the plasma density. The measurements and numerical sheath simulation demonstrate the scaling behavior as a function of changing sheath impedance for various plasma conditions. ? 2010 American Vacuum Society.
Type
journal article

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