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Impurity induced bond-softening and defect states in ZnO:Cu.
- Source :
-
Journal of Applied Physics . Aug2011, Vol. 110 Issue 4, p043523. 4p. - Publication Year :
- 2011
-
Abstract
- Phonons and optical properties of Cu-doped ZnO have been investigated using micro-Raman and photoluminescence (PL) spectroscopy. Two new modes found in Raman spectra are assigned to Cu-O impurity vibrations analogous to polar A1 and E1 modes of ZnO on the basis of a Cu-O force constant lower than that of the Zn-O bond. The reduction in the frequencies of the nonpolar E2 modes also appears to arise due to softening of the mixed crystal. In the PL spectrum at 80 K a prominent blue emission arises due to Cu-related intraband transitions. Temperature dependent PL spectrum confirms the existence of donor acceptor pair transition at 3.305 eV in ZnO:Cu system. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ZINC oxide
*OXIDES
*ZINC compounds
*PHOTOLUMINESCENCE
*SPECTRUM analysis
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 110
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 65108591
- Full Text :
- https://doi.org/10.1063/1.3624918