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Resonant-Raman Scattering of ZnO Crystallites: the Quasi Nature of the LO Mode

Published online by Cambridge University Press:  01 February 2011

Xiang-Bai Chen ,
John L. Morrison ,
Jesse Huso ,
Jonathan G. Metzger ,
Leah Bergman  and
Shlomo Efrima
Xiang-Bai Chen
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83843–0903
John L. Morrison
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83843–0903
Jesse Huso
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83843–0903
Jonathan G. Metzger
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83843–0903
Leah Bergman
Affiliation:
Department of Physics, University of Idaho, Moscow, ID 83843–0903
Shlomo Efrima
Affiliation:
Department of Chemistry, and the Ilse Katz Center for Meso and Nanoscale Science and Technology, Ben-Gurion University, ISRAEL
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Abstract

The Raman modes of ZnO crystallites of the wurtzite structure were investigated via micro-Raman scattering at resonant and out-of-resonant conditions. The E2 mode was the predominant mode in the spectra for out-of-resonant conditions. For the resonant conditions one mode at the spectral range of the LO's of ZnO single crystal was the predominant mode: its frequency was found to be at ∼ 580 cm−1. The A1(LO) and the E1(LO) modes of a reference ZnO single crystal were found to be 568 cm−1 and 586 cm−1 respectively. Two possible mechanisms were considered that may explain the mode frequency of the crystallites: it can be regarded as a confined E1(LO) mode or as a quasi-LO mode. The UV-photoluminescence of the crystallites was found to have the same energy as that of the single crystal ∼ 3.3 eV, indicating the lack of size-confinement of the electronic states in the crystallites, and inter alia that of the phonon states. Our analysis indicated that the observed frequency can be explained in terms of Loudon's model of a quasi-mode behavior which is due to the crystallites tilt.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 831: Symposium E – GaN, AlN, InN, and Their Alloys , 2004 , E11.5
Copyright
Copyright © Materials Research Society 2005

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References

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