The occurrence of optically-induced, metastable changes in the paramagnetism in films of a-Si:H is well known. The effect was first observed with white light in powdered samples, but recent experiments with both white and monochromatic light incident on films on substrates have observed a similar effect. This optically-induced ESR appears to be stable at temperatures ≤ 400 K. Typical inducing curves for samples with initial dark spin densities ns > 1016 spins/cm3 approach a power law behavior (ns ∼ t1/3) at long times. However, when the dark spin density is less than 1016 spins/cm3, the samples exhibit an inducing curve (on a log-log scale) with a continuously decreasing slope. The curve does not exhibit a unique power law behavior over an extended range of time and is at all times ≤ t1/3.
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H. Dersch, J. Stuke and J. Beichler, Appl. Phys. Lett. 38, 456 (1981).
D.L. Staebler and C.R. Wronski, Appl. Phys. Lett. 31, 292 (1977); J. Appl. Phys. 51, 3262 (1980).
C. Lee, W.D. Ohlsen, P.C. Taylor, H.S. Ullal and G.P. Ceasar, in AIP Conf. Proc. 120, 205 (1984).
M. Stutzmann, W.B. Jackson and C.C. Tsai, in AIP Conf. Proc. 120, 213 (1984); Phys. Rev. B32, 23 (1985).
H. Yokomichi, M. Kumeda, A. Morimoto and T. Shimizu, Jpn. J. Appl. Phys. 24, L569 (1985).
M. Kumeda, M. Uno, A. Morimoto and T. Shimizu, Jpn. J. Appl. Phys. 25 (1985), in press.
M. Gal, J.M. Viner, P.C. Taylor and R.D. Wieting, Phys. Rev. B31, 4060 (1985).
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Lee, C., Ohlsen, W.D. & Taylor, P.C. Time Dependence of the Metastable, Optically-Induced ESR in a-Si:H. MRS Online Proceedings Library 70, 225–229 (1986). https://doi.org/10.1557/PROC-70-225