Hostname: page-component-54dcc4c588-gwv8j Total loading time: 0 Render date: 2025-09-11T17:17:27.675Z Has data issue: false hasContentIssue false
  • English
  • Français

States in the Gap of Doped and Undoped a-Si:H Studied by Photomodulation Spectroscopy

Published online by Cambridge University Press:  26 February 2011

T. X. Zhou ,
Z. Vardeny  and
J. Tauc
T. X. Zhou
Affiliation:
Division of Engineering and Department of Physics Brown University, Providence, Rhode Island 02912
Z. Vardeny
Affiliation:
Division of Engineering and Department of Physics Brown University, Providence, Rhode Island 02912
J. Tauc
Affiliation:
Division of Engineering and Department of Physics Brown University, Providence, Rhode Island 02912
Get access

Abstract

The steady state photomodulation spectrum, its temperature and excitation intensity dependences have been studied in phosphorous doped and undoped a-Si:H. The spectra are analyzed in terms of photocarriers trapped in band-tail states and dangling bonds (DB) defects in undoped samples and impurities and charged DB states introduced by doping in P-doped samples. In undoped a-Si:H we found that the two DB energy levels D± are symmetrically located about midgap with an effective correlation energy Ueff of 0.6±0.2eV. In P-doped a-Si:H D− is pushed toward midgap by about 0.25 eV and Ueff = 0.4±0. 2 eV.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 95: Symposium E – Amorphous Silicon Semiconductors--Pure and Hydrogenated , 1987 , 51
Copyright
Copyright © Materials Research Society 1987

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.)

Article purchase

Temporarily unavailable

References

1 Tauc, J., Festkoerperprobleme, Vol. XX11, p.85 (Vieweg, Braunschweig, 1982).Google Scholar
2 O'Connor, P. and Tauc, J., Phys. Rev. B 25 2748 (1982).Google Scholar
3 Vardeny, Z. and Tauc, J., Phys. Rev. Let. 54, 1844 (1985).Google Scholar
4 Stoddart, H., Ph. D. thesis, Brown University 1987 (unpublished).Google Scholar
5 Tauc, J. and Vardeny, Z., Phil Mag. B 52 313 (1985).Google Scholar
6 Vardeny, Z., Zhou, T. X., Stoddart, H. and Tauc, J., Phys. Rev. B. (submitted).Google Scholar
7 Dersch, H., Stuke, T. and Beichler, J., Phys. Stat. Sol. (b) 105 265 (1981).Google Scholar
8 Lang, D. V., Cohen, J. D. and Harbison, J. P., Phys. Rev. B 25, 5285 (1982).Google Scholar
9 Vardeny, Z., Thomsen, C. and Tauc, J., Phys. Rev. Lett. (Submitted).Google Scholar
10 Jan, Kocka, J. of Non-Cryst. Solids, in press.Google Scholar
11 Adler, D., Alp Conf. Prec. No. 120 (ALP, New York, 1984) p. 70.Google Scholar
12 Jackson, W. B., Sol. State Commun. 44 477 (1982).Google Scholar