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Breaking of Raman selection rules in Cu2O by intrinsic point defects

Published online by Cambridge University Press:  14 January 2014

Thomas Sander ,
Christian T. Reindl  and
Peter J. Klar
Thomas Sander*
Affiliation:
I. Physikalisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Gießen, Germany
Christian T. Reindl
Affiliation:
I. Physikalisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Gießen, Germany
Peter J. Klar
Affiliation:
I. Physikalisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Gießen, Germany
*
*[email protected]
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Abstract

The semiconductor cuprous oxide crystallizes in a simple cubic structure and reveals outstanding characteristics: Independent of the method and conditions of the synthesis of crystalline Cu2O its Raman spectra are dominated by infrared active, silent, and defect modes rather than by Raman allowed phonon modes only. A detailed group theoretical analysis demonstrates that point defects reduce the local symmetry, lift the Raman selection rules, and thus diminish the distinction between Raman allowed and Raman forbidden lattice vibrations. Of all intrinsic defects only the presence of the copper vacancy in the so called split configuration introduces possible Raman activity for all Cu2O extended phonon modes observed in experiment.

Keywords

Raman spectroscopyoxidedefects
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1633: Symposium R – Oxide Semiconductors , 2014 , pp. 81 - 86
Copyright
Copyright © Materials Research Society 2014 

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