Abstract
The effects of long-range potential fluctuations (LRPF) on the d.c. and a.c. photoconductivities of undoped hydrogenated amorphous silicon (a-Si : H) have been discussed in the temperature region 20–300 K. It is found that the a.c. photoconductivity in the entire temperature range is dominated by dielectric relaxation, and not by any electronic hopping motion. A reasonable fit of the experimental data to a model calculation based on LRPF is obtained, and the extent of the potential fluctuations is deduced to be ∼0.06 eV in energy and ∼10 nm on a length scale.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J. H. Zhou and S. R. Elliott, Philos. Mag. B 66 (1992) 801; Phys. Rev. B 48 (1993) 1505.
S. D. Baranovskii, P. Thomas and G. J. Adriaenssens, in “Electronic, Optoelectronic, and Magnetic Thin Films”, edited by J. M. Marshall, N. Kirov and A. Vavrek (Research Studies Press, Taunton, 1995) p. 35.
H. M. Branz and M. Silver, Phys. Rev. B 42 (1990) 7420.
S. D. Baranovskii, F. Hensel, K. Rukes, P. Thomas and G. J. Adriaenssens, J. Non-Cryst. Solids 190 (1995) 117.
H. Overhof and W. Beyer, Philos. Mag. B 44 (1981) 317.
H. Overhof and P. Thomas, “Electronic Transport in Hydrogenated Amorphous Semiconductors” (Springer, Berlin, 1989).
A. R. Long, Philos. Mag. B 59 (1989) 377.
K. Shimakawa, A. Kondo, M. Goto and A. R. Long, J. Non-Cryst. Solids 198–200 (1996) 157.
J. A. Howard and R. A. Street, Phys. Rev. B 44 (1991) 7935.
K. Murayama and M. Mori, Philos. Mag. B 65 (1992) 501.
K. Shimakawa, Philos. Mag. Lett. 74 (1996) 289.
K. Shimakawa and A. Ganjoo, Phys. Rev. B 65 (2002) 165213; J. Non-Cryst. Solids 299–302 (2002) 339.
K. Shimakawa, Philos. Mag. Lett. 82 (2002) 635.
D. L. Staebler and C. R. Wronski, Appl. Phys. Lett. 31 (1977) 292.
A. Vomvas and H. Fritzsche, J. Non-Cryst. Solids 97&98 (1987) 823.
B. I. Shklovskii, E. I. Levin, H. Fritzsche and S. D. Baranovskii, in “Transport, Correlation, and Structural Defects”, edited by H. Fritzsche (World Scientific, Singapore, 1990) p. 161.
K. Morigaki, “Physics of Amorphous Semiconductors” (Imperial College Press and World Scientific, London, 1999).
J. C. Dyre, J. Appl. Phys. 54 (1988) 2456; Phys. Rev. B 48 (1993) 12511; Rev. Mod. Phys. 72 (2000) 873.
R. A. Street, Philos. Mag. B 49 (1984) L9.
R. H. Bube, “Photoelectronic Properties of Semiconductors” (Cambridge University Press, UK, 1992).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Shimakawa, K. Influence of potential fluctuations on photoconductivity in a-Si : H. Journal of Materials Science: Materials in Electronics 14, 685–688 (2003). https://doi.org/10.1023/A:1026122919359
Issue Date:
DOI: https://doi.org/10.1023/A:1026122919359