1. B. Goldstein and C. R. Dickson, Appl. Phys. Lett. 53, 2672 (1988).
2. S. Y. Myong, S. S. Kim, O. Shevaleevskii, et al., in Proceedings of 29th IEEE Photovoltaic Specialists Conference (New Orleans, USA, 2002), p. 1226.
3. A. G. Kazanskii, P. A. Forsh, K. Yu. Khabarov, and M. V. Chukiev, Fiz. Tekh. Poluprovodn. (St. Petersburg) 37, 1100 (2003) [Semiconductors 37, 1076 (2003)].
4. S. Ghosh, A. Dasgupta, and S. Ray, J. Appl. Phys. 78, 3200 (1995).
5. J. K. Rath, Sol. Energy Mater. Sol. Cells 76, 431 (2003).