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Axial Temperatures and Electron Densities in a Flowing Cascaded arc

Published online by Cambridge University Press:  21 February 2011

J.J. Beulens ,
M. de Graaf ,
G. M. W. Kroesen  and
D. C. Schram
J.J. Beulens
Affiliation:
University of Technology, Dept. of Physics, P.O.Box 513, 5600 MB Eindhoven.
M. de Graaf
Affiliation:
University of Technology, Dept. of Physics, P.O.Box 513, 5600 MB Eindhoven.
G. M. W. Kroesen
Affiliation:
University of Technology, Dept. of Physics, P.O.Box 513, 5600 MB Eindhoven.
D. C. Schram
Affiliation:
University of Technology, Dept. of Physics, P.O.Box 513, 5600 MB Eindhoven.
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Abstract

Since about 1985 a cascaded arc is used as a particle source in the deposition machine described by Kroesen [1a,1b]. This method of deposition showed to be very fast and efficient to grow amorphous carbon films (a–C:H), varying from graphite and diamond to polymers [1,2]. The most important difference of this method, with respect to R.F. techniques, is that the three most important functions of a deposition process, as there are dissociation/ionization, transport and deposition are spatially separated. The dissociation takes place in a cascaded arc burning on argon. The temperatures in the arc are about 10000–12000 K. At the end of this arc hydrocarbons are injected which are then dissociated and ionized effectively. At the end of the arc the plasma expands supersonically into a vacuum vessel. That means that the plasma cools down and the formed hydrocarbon fractions are transported towards the substrate, where an amorphous carbon film can grow. The quality of the films depend mainly on the amount of energy available for each injected carbon atom. The behavior of the refractive index as a function of this energy could be a confirmation that in our deposition method the carbon ions rather than radicals govern the deposition process [1,3,4]. Therefore the cascaded arc is investigated numerically and experimentally in order to improve the ionization efficiency. The conservation laws for mass, momentum and energy for both the electrons and the heavy particles are solved 2 dimensionally by a control volume numerical method with a non, staggered grid. By Fabry Perot interferometry heavy particle temperatures, electron temperatures and electron densities as a function of the axial position in the cascaded arc are measured. The obtained numerical results are compared to the experimental data, obtained by the optical Fabry Perot diagnostics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 190: Symposium M – Plasma Processing and Synthesis of Materials III , 1990 , 311
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

[1a] Kroesen, G.M W.,PH. D. thesis, University of Technology Eindhoven, the Netherlands (1988).Google Scholar
[1b] Kroesen, G.M.W., Schram, D.C., de Haas, J.C.M., Description of a flowing cascade arc plasma, to be published.Google Scholar
[2] Bachmann, P.K., Beulens, J.J., Kroesen, G.M.W., Lydtin, H, Schram, D.C. and Wiechert, D.U., proceedings of the TMS conference, aug.28-sept.1 1989.Google Scholar
[3] Savvides, N. and Window, B., J. Vac. Sci. Technol. A3, 2386, 1985.Google Scholar
[4] Savvides, N., J. Appl. Phys. 59,4133,1986.Google Scholar
[5] Griem, H.R.,“Spectral line broadening by plasmas”, Academic press, New York, USA(1974).Google Scholar
[6] Sobel'man, , “Introduction to the theory of atomic spectra”, Pergamon press, Oxford (1972)Google Scholar
[7] Drawin, H.W. and Felenbok, P., “Data for plasmas in LTE”, Gauthier-Villars, Paris(1965).Google Scholar
[8] Timmermans, C.J., Rosado, R.J. and Schram, D.C., Z. Naturforschung 40A(1985)810.Google Scholar
[9] de Haas, J.C.M., Ph. D. thesis, University of Technology Eindhoven, the Netherlands (1986).Google Scholar
[10] Milojevic, D., A two dimensional model for flowing cascaded arc plasma, to be published.Google Scholar
[11] Patankar, S.V. and Spalding, D.B., Int. J. Heat and Mass Transfer 15(1972)1787 Google Scholar
[12] Patankar, S.V., ‘Numerical Heat transfer and fluid flow’, McGraw Hill, NY USA (1980)Google Scholar
[13] Peric, M., Kessler, R. and Scheurer, G., 1987 University Erlangen-Nurnberg, Lehrstuhl fur Stromungsmechanik, Report LSTM 163/T/87.Google Scholar
[4] Majumdar, S., Numerical Heat Transfer 13(1988)125.Google Scholar
[15] Jensen, D.E., Spalding, D.B., Tatchell, D.G. and Wilson, A.S., Combustion and Flame 34(1979)309.Google Scholar
[16] Stone, H.L., SIAM J. Num. Anal. 5(1968)530.Google Scholar
[17] Mostagimi, J., Proulx, P. and Boulos, M.I., Numerical Heat Transfer 8(1985)187.Google Scholar
[18] Mostagimi, J., Proulx, P. and Boulos, M.I., J. Appl. Phys. 61(1987)1753.Google Scholar