1. Proceedings of MRS Symposium on Amorphous Silicon Technology, Ed. by M. Hack, E. A. Schiff, S. Wagner, R. Schropp, and A. Matsuda (Pittsburgh, Pennsylvania, 1996), Vol. 420.
2. Proceedings of MRS Symposium on Rare Earth Doped Semiconductors II, Ed. by S. Coffa, A. Polman, and R. N. Schwartz (Pittsburgh, Pennsylvania, 1996), Vol. 422.
3. Proceedings of MRS Symposium on Material and Devices for Silicon-Based Optoelectronics, Ed. by A. Polman, S. Coffa, and R. Soref (Warrendale, Pennsylvania, 1997), Vol. 486.
4. P. O’Connor and J. Tauc, Phys. Rev. B 25(4), 2748 (1982).
5. S. Komuro, Y. Aoyagi, Y. Segawa, et al., Appl. Phys. Lett. 42(1), 79 (1983).