Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-19T22:09:06.158Z Has data issue: false hasContentIssue false
  • English
  • Français

Low Temperature Optically Induced Esr in a-Si:H and the Presence of Interface States

Published online by Cambridge University Press:  25 February 2011

J. Ristein ,
J. Hautala  and
P. C. Taylor
J. Ristein
Affiliation:
FB Physik University Marburg, Renthof 5, 3550
J. Hautala
Affiliation:
Department of Physics, University of Utah Salt Lake City, UT 84112
P. C. Taylor
Affiliation:
Department of Physics, University of Utah Salt Lake City, UT 84112
Get access

Abstract

Comparative studies of low-temperature (T ∼ 30 K) optically induced ESR using above gap red (633 nm) and below gap i.r. (1060 nm) light have been performed on several samples of a-Si:H. Experiments were performed on both films on quartz substrates and on powdered samples which were removed from the substrates. Excitation with red light always yields the well-known light induced ESR (LESR) spectrum which is ascribed to a superposition of two resonances: electrons trapped in conduction band-tail states and holes trapped in valence band tail states in a 1:1 ratio. On the other hand, excitation with i.r. light results in a different LESR spectrum with an enhanced feature overlapping with the signal attributed to trapped band-tail electrons. Although observed on all films studied on quartz substrates, this asymmetry is not observed in a powdered sample where only the band tail electron and hole resonances are observed in the ratio 1:1. This result suggests that interface states are responsible for the excess LESR spin density in the films on quartz substrates. Experiments performed as a function of film thickness confirm this interpretation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 149: Symposium E – Amorphous Silicon Technology - 1989 , 1989 , 717
Copyright
Copyright © Materials Research Society 1989

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Street, R.A. and Biegelsen, D.K., J. Non-Cryst. Solids 35+36, 651 (1980).Google Scholar
2. Street, R.A. and Biegelsen, D.K., Solid State Commun. 33, 1159 (1980).Google Scholar
3. LeComber, P.G. and Spear, W., Philos. Mag. B53, L1 (1986).Google Scholar
4. Winer, K., Hirabayashi, I. and Ley, L., Phys. Rev. B 38, 7680 (1988).CrossRefGoogle Scholar
5. Winer, K. and Ley, L., J. Vac. Sci. Technol. B6, 1165 (1988).CrossRefGoogle Scholar
6. Winer, K. and Ley, L., Phys. Rev. B 37, 8363 (1988).Google Scholar
7. Branz, H.M., Phys. Rev. B 39, 5107 (1989).CrossRefGoogle Scholar
8. Branz, H.M. and Silver, M., unpublished.Google Scholar