Abstract
The polarized Raman spectra of an array of vertical zinc oxide microrods prepared by the carbothermal synthesis on a Si(001) substrate have been investigated. The length and diameter of the rods are 9 ± 0.5 μm and 210 ± 50 nm, respectively. X-ray diffraction studies have confirmed the mutual crystallographic orientation [001]ZnO ‖ [001]Si in the direction normal to the substrate plane. In the Raman spectra of the rods, there are modes forbidden by selection rules for the single crystal: the A 1(TO) E high2 and modes in the scattering geometry \(x\left( {yz} \right)\bar x\) and the E 1(LO) mode in the geometry \(x\left( {zz} \right)\bar x\). It has been found that the spectra contain quasi-modes Q(TO) and Q(LO), the spectral position of which shifts with a variation in the angle of incidence of the exciting radiation. The angle range of propagation of the exciting radiation in the array of rods is estimated as ∼25° for a fixed angle of incidence by comparing the spectral shift of the quasi-modes with experimental data for the single crystal.
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Original Russian Text © N.V. Lyanguzov, A.S. Anokhin, D.I. Levshov, E.M. Kaidashev, Yu.I. Yuzyuk, I.N. Zakharchenko, O.A. Bunina, 2014, published in Fizika Tverdogo Tela, 2014, Vol. 56, No. 3, pp. 542–548.
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Lyanguzov, N.V., Anokhin, A.S., Levshov, D.I. et al. Specific features of optical phonons in raman spectra of an array of vertical ZnO microrods on silicon. Phys. Solid State 56, 561–567 (2014). https://doi.org/10.1134/S1063783414030184
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DOI: https://doi.org/10.1134/S1063783414030184