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Effect of plasmon–phonon interaction on the infrared reflection spectra of MgxZn1-xO/Al2O3 structures

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Abstract

The effect of plasmon–phonon interaction on the vibrational properties of the MgxZn1-xO films on anisotropic substrate is studied versus Mg content (x), film thickness (0.5–20 μm), free carrier concentration (1×1016–5×1018 cm−3) and damping coefficients using infrared reflection spectroscopy. The mathematical model with additive and phenomenological contribution of several oscillators to dielectric permittivity of MgxZn1-xO material was developed. The infrared reflection spectra were simulated in the range of “residual rays” of the film and the substrate for MgxZn1-xO/Al2O3 structures using self-consisted parameters of bulk ZnO, MgO and Al2O3 materials. Based on the Kramers–Kronig relationship, the frequency range where film reflectivity is sensitive to the variation of film doping and thickness was determined. The frequencies and damping coefficients of TO and LO modes of the oscillators, static and high-frequency dielectric permittivity for orientation E⊥c were obtained with high accuracy. Main attention was paid to the compositions which were in hexagonal structure. Experimental infrared reflection spectra were recorded for the films with x = 0.25 additionally doped with manganese and their simulation was performed based on the model developed. The free carrier concentration and mobility as well as film conductivity were determined. The results obtained showed the utility of infrared reflection spectroscopy for the investigation of textured alloy films. This non-destructive and contactless method can be implemented for the determination of optical properties of other semiconductor films.

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Acknowledgements

This work was partly supported by the Ministry of Education and Science of Ukraine (Project 89452).

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Authors and Affiliations

  1. Mykola Gogol State University of Nizhyn, 2 Hrafska Str., Nizhyn, 16600, Ukraine

    O. Melnichuk & L. Melnichuk

  2. V. Lashkaryov Institute of Semiconductor Physics of NAS of Ukraine, 45 Pr. Nauky, 03650, Kyiv, Ukraine

    Ye. Venger, N. Korsunska & L. Khomenkova

  3. Instituto Politécnico Nacional-IPN, ESFM, Ave. IPN, Mexico City, 07738, Mexico

    T. Torchynska

  4. National University “Kyiv-Mohyla Academy”, 2 Skovorody Str., Kyiv, 04070, Ukraine

    L. Khomenkova

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  1. O. Melnichuk
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Melnichuk, O., Melnichuk, L., Venger, Y. et al. Effect of plasmon–phonon interaction on the infrared reflection spectra of MgxZn1-xO/Al2O3 structures. J Mater Sci: Mater Electron 31, 7539–7546 (2020). https://doi.org/10.1007/s10854-020-03110-6

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