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Effects of impurity band in heavily doped ZnO:HCl
Moldova State Univ, Moldova.
Polish Acad Sci, Poland.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. Frantsevich Inst Problems Mat Sci NASU, Ukraine.
Moldova State Univ, Moldova.
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2019 (English)In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 553, p. 174-181Article in journal (Refereed) Published
Abstract [en]

A comparative study of properties of ZnO:HCl single crystals obtained by various methods is presented. Characterization by photoluminescence, optical and electrical measurements in the wide temperature range has allowed to analyze the energy spectra of Cl-containing stable defects in ZnO. Presence of shallow Cl donors, deeper donor complexes, incorporating several Cl atoms or stable H-Cl pairs and presence of compensating deep acceptors, attributed to VznClo centers, are demonstrated. The presence of shallow donor impurity band, as well as strong dependence of its activation energy on the doping level is shown. The controversy of various models for estimation of this dependence is discussed. It is demonstrated, that 90% of this dependence is caused by feature of temperature dependence of Hall coefficient related to conductive impurity band, and a more correct equation for activation energy is suggested. An abnormally low efficiency of neutral impurity scattering of charge carriers and strong optical absorption in the near-IR spectral range are demonstrated and attributed to upper conductive impurity band of negatively charged donors with an extra electron.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 553, p. 174-181
Keywords [en]
Halide vapor transport; Zinc oxide; Impurity band; Donor activation energy; Carrier transport phenomena
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-153143DOI: 10.1016/j.physb.2018.10.031ISI: 000450602300025OAI: oai:DiVA.org:liu-153143DiVA, id: diva2:1267343
Note

Funding Agencies|Supreme Council for Science and Technological Development of the Academy of Sciences of Moldova [15.817.02.34A]

Available from: 2018-12-01 Created: 2018-12-01 Last updated: 2019-03-22

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The full text will be freely available from 2020-10-25 12:55
Available from 2020-10-25 12:55

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