1. D. Lee et al. J. Electron. Mater. 27, 709 (1998); and references therein.
2. N.V. Joshi, Photoconductivity (New York: Marcel Dekker Inc., 1990), p. 284.
3. D.K. Schroder, Semiconductor Material and Device Characterization (New York: John Wiley & Sons, 1990), p. 359.
4. P.C. Catagnus and C.T. Baker, U.S. patent 3,977,018 (August 1976).
5. S.M. Sze, Physics of Semiconductor Devices, 2nd ed. (New Delhi, India: Wiley Eastern Limited, 1981), p. 381.