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Optical and vibrational properties of (ZnO)k In2O3 natural superlattice nanostructures

Abstract : A thermodynamically stable series of superlattices, (ZnO)kIn2O3, form in the ZnO-In2O3 binary oxide system for InO1.5 concentrations from about 13 up to about 33 mole percent (m/o). These natural superlattices, which consist of a periodic stacking of single, two-dimensional sheets of InO6 octahedra, are found to give rise to systematic changes in the optical and vibrational properties of the superlattices. Low-frequency Raman scattering provides the evidence for the activation of acoustic phonons due to the folding of Brillouin zone. New vibrational modes at 520 and 620 cm-1, not present in either ZnO or In2O3, become Raman active. These new modes are attributed to collective plasmon oscillations localized at the two-dimensional InO1.5 sheets. Infrared reflectivity experiments, and simulations taking into account a negative dielectric susceptibility due to electron carriers in ZnO and interface modes of the dielectric layer of InO2, explain the occurrence of these new modes. We postulate that a localized electron gas forms at the ZnO/InO2 interface due to the electron band alignment and polarization effects. All our observations suggest that there are quantum contributions to the thermal and electrical conductivity in these natural superlattices. © 2016 Author(s).
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Samuel Margueron, Jan Pokorny, Stella Skiadopoulou, Stella Kamba, Xin Liang, et al.. Optical and vibrational properties of (ZnO)k In2O3 natural superlattice nanostructures. Journal of Applied Physics, American Institute of Physics, 2016, 119 (19), pp.195103. ⟨10.1063/1.4950789⟩. ⟨hal-02432416⟩



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