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Title: Characterization of point defects in CdTe by positron annihilation spectroscopy

Abstract

Positron lifetime measurements on CdTe 0.15% Zn-doped by weight are presented, trapping to monovacancy defects is observed. At low temperatures, localization at shallow binding energy positron traps dominates. To aid defect identification density functional theory, calculated positron lifetimes and momentum distributions are obtained using relaxed geometry configurations of the monovacancy defects and the Te antisite. These calculations provide evidence that combined positron lifetime and coincidence Doppler spectroscopy measurements have the capability to identify neutral or negative charge states of the monovacancies, the Te antisite, A-centers, and divacancy defects in CdTe.

Authors:
 [1];  [2]; ;  [1];  [3]
  1. Carnegie Laboratory of Physics, SUPA, School of Science and Engineering, University of Dundee, Dundee DD1 4HN (United Kingdom)
  2. (Egypt)
  3. Physics Department, Faculty of Science, Minia University, P.O. Box 61519, Minia (Egypt)
Publication Date:
OSTI Identifier:
22590784
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 24; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BINDING ENERGY; CADMIUM TELLURIDES; CHARGE STATES; DENSITY FUNCTIONAL METHOD; DISTRIBUTION; DOPED MATERIALS; POSITRONS; TRAPPING; TRAPS; POSITRON ANNIHILATION SPECTROSCOPY

Citation Formats

Elsharkawy, M. R. M., Physics Department, Faculty of Science, Minia University, P.O. Box 61519, Minia, Kanda, G. S., Keeble, D. J., E-mail: d.j.keeble@dundee.ac.uk, and Abdel-Hady, E. E.. Characterization of point defects in CdTe by positron annihilation spectroscopy. United States: N. p., 2016. Web. doi:10.1063/1.4953781.
Elsharkawy, M. R. M., Physics Department, Faculty of Science, Minia University, P.O. Box 61519, Minia, Kanda, G. S., Keeble, D. J., E-mail: d.j.keeble@dundee.ac.uk, & Abdel-Hady, E. E.. Characterization of point defects in CdTe by positron annihilation spectroscopy. United States. doi:10.1063/1.4953781.
Elsharkawy, M. R. M., Physics Department, Faculty of Science, Minia University, P.O. Box 61519, Minia, Kanda, G. S., Keeble, D. J., E-mail: d.j.keeble@dundee.ac.uk, and Abdel-Hady, E. E.. Mon . "Characterization of point defects in CdTe by positron annihilation spectroscopy". United States. doi:10.1063/1.4953781.
@article{osti_22590784,
title = {Characterization of point defects in CdTe by positron annihilation spectroscopy},
author = {Elsharkawy, M. R. M. and Physics Department, Faculty of Science, Minia University, P.O. Box 61519, Minia and Kanda, G. S. and Keeble, D. J., E-mail: d.j.keeble@dundee.ac.uk and Abdel-Hady, E. E.},
abstractNote = {Positron lifetime measurements on CdTe 0.15% Zn-doped by weight are presented, trapping to monovacancy defects is observed. At low temperatures, localization at shallow binding energy positron traps dominates. To aid defect identification density functional theory, calculated positron lifetimes and momentum distributions are obtained using relaxed geometry configurations of the monovacancy defects and the Te antisite. These calculations provide evidence that combined positron lifetime and coincidence Doppler spectroscopy measurements have the capability to identify neutral or negative charge states of the monovacancies, the Te antisite, A-centers, and divacancy defects in CdTe.},
doi = {10.1063/1.4953781},
journal = {Applied Physics Letters},
number = 24,
volume = 108,
place = {United States},
year = {Mon Jun 13 00:00:00 EDT 2016},
month = {Mon Jun 13 00:00:00 EDT 2016}
}