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2011 | 119 | 5 | 678-680

Article title

Anharmonic Optical Phonon Effects in ZnO Nanocrystals

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EN

Abstracts

EN
Zinc oxide (ZnO) is a very promising material for optoelectrical devices operating at the short-wavelength end of the visible spectral range and at the near UV. The Raman scattering studies of ZnO heterolayers formed by isothermal annealing show sharp phonon lines. In addition to the A_1(TO), E_1(TO), E_2^{H}, and E_1(LO) one-phonon lines, we observed two-phonon lines identified as: E_2^{H} - E_2^{L}, E_2^{H} + E_2^{L}, and 2LO at 332, 541, and 1160 cm^{-1}, respectively (at room temperature). The identification of the E_2^{H} - E_2^{L} peak was confirmed by its thermal dependence. Temperature dependent measurements in the range 6-300 K show that the phonon frequencies decrease with temperature. The E_2^{H} peak is at energy 54.44 meV (439.1 cm^{-1}), at 4 K and due to phonon-phonon anharmonic interaction, its energy decreases to 54.33 meV (438.2 cm^{-1}) at room temperature. The Grüneisen parameter found for this oscillation mode was γ_{E} 2H = 1.1 at about 300 K. The intensity of the E_2^{H} - E_2^{L} peak increases strongly with temperature and this dependence can be described by the Bose-Einstein statistics with activation energy of 13.8 meV (nearly equal to the energy of the E_2^{L} phonon).

Keywords

EN

Contributors

  • Yuriy Fedkovych Chernivtsi National University, Kotsubinsky Str., 2, 58012, Chernivtsi, Ukraine
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
  • Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warszawa, Poland
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
author
  • Yuriy Fedkovych Chernivtsi National University, Kotsubinsky Str., 2, 58012, Chernivtsi, Ukraine
author
  • Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warszawa, Poland
author
  • Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warszawa, Poland

References

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.bwnjournal-article-appv119n532kz
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