1. D. RIOUS, D. W. NILES and H. HOCHST, J. Appl. Phys.73 (1993) 8381.
2. T. A. GESSERT and T. J. COUTS, in Proceedings of the 12th NREL Photovoltaic Program Review (1993) p. 345.
3. T. A. GESSERT, A. R. MASON, R. C. REEDY, R. MASTON, T. J. COUTS and P. SHEILDON, J. Electron. Mater, 34 (1995) 1443.
4. J. TANG, D. MAO, L. FENG, W. SONG, and J. U. TREFAY in Proceedings of the 25th PVSC, 13-17 May 1996, Washington DC (1996) p. 952.
5. L. FENG, D. MAO, J. TANG, R. T. CULINS and J. U. TREFAY, J. Electron. Mater. 25 (1996) 1442.