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Growth of Germanium Carbon Alloy by Pecvd Using Silane as a Growth Promoter

  • Paul R. Moffitt (a1), H. A. Naseem (a1), S. S. Ang (a1) and W. D. Brown (a1)


A possible alternative to a-SiGe for use in multijunction solar cells is a-GeC alloy. Only preliminary work has been done so far on this alloy, Mostly for use as an IR anti-reflection coating, with little study done on its optoelectronic properties. GeC films were grown by the PECVD Method from a novel gas mixture using GeF4 as the germanium source gas. Methane was used as the carbon source, with H2 being added for additional hydrogenation of the film. It was found that adding silane to the mixture would increase the growth rate from less than 1 Å/s up to 30 Å/s. The films contained no detectable silicon, even at mixture ratios of five SiH4 to one GeF4. Varying the amount of methane in the gas mixture allowed the film optical bandgap to be adjusted from 1.1 eV to 1.8 eV. The effect of other parameters such as RF power level and H2 flow rate on bandgap and growth rate were also explored. Optoelectronic properties in the 1.2 to 1.4 eV bandgap range will also be reported.



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[1] Luft, W. in Proceedings of the 20th Photovoltaic Specialist' Conference (IEEE, 1, New York, 1989) pp. 218223.
[2] Anderson, D. A. and Spear, W. E., Philos. Mag. 35, 1 (1977).
[3] Lettington, A. H., Wort, C. J. H. and Monachan, B. C. in Window and Dome Technologies and Materials, edited by Kloceck, P. (SPIE, 1112, Bellingham WA, 1989) pp. 156161.
[4] Sah, R. E., Wild, Ch. and Koidl, P. in Hard Materials in Optics, edited by Ribbing, C. G. (SPIE, 1275, Bellingham WA, 1990) pp. 5965.
[5] Machowski, J. M., Cimma, B. and Pignard, R. in Window and Dome Technologies and Materials III, (SPIE, 1760, Bellingham WA, 1992) pp. 201209.
[6] Martin, P. M., Johnston, J. W. and Bennet, W. D. in Optical Thin Films III, New Developments, edited by Seddon, R. I. (SPIE, 1323, Bellingham WA, 1990) pp. 291298.
[7] Tyczkowski, J., Odrobina, Ewa, Gazick, M. and Olcaytua, F., Jörn, of Non-cryst. Solids, 137 & 138, 875 (1991).
[8] Kumru, Mustafa, Thin Solid Films, 198, 75 (1991).
[9] ECHIP Version 6.0 for Windows, ECHIP Inc. Hockessin, DE, (1993).
[10] Catherine, Y. and Turban, G., Thin Solid Films, 70, 101 (1980).
[11] Paul, William, Jones, Scott J., Turner, Warren A. and Wickboldt, Paul, Journ. of Non-cryst. Solids, 141, 271 (1992).

Growth of Germanium Carbon Alloy by Pecvd Using Silane as a Growth Promoter

  • Paul R. Moffitt (a1), H. A. Naseem (a1), S. S. Ang (a1) and W. D. Brown (a1)


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