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Phase discrimination in CdSe structures by means of Raman scattering

AuthorsCuscó, Ramón ; Consonni, V.; Bellet-Amalric, E.; André, R.; Artús, Lluís
Density functional theory
Raman spectroscopy
Issue Date2017
CitationPhysica Status Solidi - Rapid Research Letters, 11(5): 1700006 (2017)
AbstractRaman spectra of epitaxial layers of CdSe grown by molecular beam epitaxy have been measured for the cubic (zincblende) and hexagonal (wurtzite) phases. The Raman spectra are examined in the light of density functional calculations for these two highly similar structures. Characteristic Raman frequencies and spectral features associated with the different symmetry are discussed and reliable criteria for phase discrimination based on Raman spectroscopy are proposed. Although LO frequencies are virtually identical in both structures and may be affected by size effects, the observation of a low energy E2 mode at 33cm-1 unambiguously identifies the wurtzite structure and can be used as a specific fingerprint to distinguish between these two phases in CdSe-based nanostructures. The slightly lower LO frequency measured in the zincblende epitaxial layer is ascribed to residual tensile strain. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Publisher version (URL)http://dx.doi.org/10.1002/pssr.201700006
Appears in Collections:(Geo3Bcn) Artículos
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