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In situ CF3 Detection in Low Pressure Inductive Discharges by Fourier Transform Infrared SpectroscopyThe detection of CF(x) (x=1-3) radicals in low pressure discharges using source gases such as CF4 and CHF3 is of importance to the understanding of their chemical structure and relevance in plasma based etching processes. These radicals are known to contribute to the formation of fluorocarbon polymer films, which affect the selectivity and anisotropy of etching. In this study, we present preliminary results of the quantitative measurement of trifluoromethyl radicals, CF3, in low pressure discharges. The discharge studied here is an inductively (transformer) coupled plasma (ICP) source in the GEC reference cell, operating on pure CF4 at pressures ranging from 10 - 100 mTorr, This plasma source generates higher electron number densities at lower operating pressures than obtainable with the parallel-plate capacitively coupled version of the GEC reference cell. Also, this expanded operating regime is more relevant to new generations of industrial plasma reactors being used by the microelectronics industry. Fourier transform infrared (FTIR) spectroscopy is employed to observe the absorption band of CF3 radicals in the electronic ground state X2Al in the region of 1233-1270/cm. The spectrometer is equipped with a high sensitivity HgCdTe (MCT) detector and has a fixed resolution of 0.125/cm. The CF3 concentrations are measured for a range of operating pressures and discharge power levels.
Document ID
20020061376
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Kim, J. S.
(Stanford Univ. United States)
Cappelli, M. A.
(Stanford Univ. United States)
Sharma, S. P.
(NASA Ames Research Center Moffett Field, CA United States)
Arnold, J. O.
Date Acquired
August 20, 2013
Publication Date
January 1, 1998
Subject Category
Plasma Physics
Meeting Information
Meeting: Gaseous Electronics Conference
Location: Hawaii
Country: United States
Start Date: October 19, 1998
End Date: October 23, 1998
Funding Number(s)
PROJECT: RTOP 632-10-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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