Article

Raman scattering of cadmium oxide epilayers grown by metal-organic vapor phase epitaxy

Institut Jaume Almera, Consell Superior d’Investigacions Científiques (CSIC), Lluís Solé i Sabarís s.n., 08028 Barcelona, Catalonia, Spain
Journal of Applied Physics (impact factor: 2.17). 04/2010; DOI:10.1063/1.3357377 pp.063519 - 063519-4
Source: IEEE Xplore

ABSTRACT We present a lattice-dynamics study of rocksalt cadmium oxide (CdO). We use Raman scattering to investigate a series of high-quality CdO epilayers grown on sapphire substrates by means of metal-organic vapor phase epitaxy. Two main features are found to dominate the Raman spectra of CdO: a sharp peak at ∼265 cm -1 and a broad feature at ∼390 cm -1 . To assign these and other weaker second-order features that appear in the Raman spectra, we have carried out an ab initio calculation of the phonon dispersion in CdO. From the calculated two-phonon density of states (PDOS) we tentatively assign the peak at 265 cm -1 to a 2 TA (L) mode. The broadband centered at ∼390 cm -1 seems to reflect the high two-PDOS in the 300–450 cm -1 spectral region.

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Keywords

ab initio calculation
 
broad feature
 
calculated two-phonon density
 
high-quality CdO epilayers
 
lattice-dynamics study
 
main features
 
metal-organic vapor phase epitaxy
 
phonon dispersion
 
sharp peak
 
weaker second-order features
 

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