PL EN


Preferences help
enabled [disable] Abstract
Number of results
2011 | 119 | 5 | 678-680
Article title

Anharmonic Optical Phonon Effects in ZnO Nanocrystals

Content
Title variants
Languages of publication
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
Year
Volume
119
Issue
5
Pages
678-680
Physical description
Dates
published
2011-05
References
  • 1. H. Morkoç, Ü. Özgür, Zinc Oxide Fundamentals. Materials and Device Technology, Wiley-VCH, Weinheim 2009
  • 2. Ü. Özgür, Ya.I. Alivov, C. Liu, A. Teke, M.A. Reshchikov, S. Dođjan, V. Avrutin, S.-J. Cho, H. Morkoç, J. Appl. Phys. 98, 041301 (2005)
  • 3. T.C. Damen, S.P.S. Porto, B. Tell, Phys. Rev. 142, p. 570 (1966)
  • 4. V.P. Makhnii, M.M. Sletov, S.V. Khusnutdinov, Inorg. Mater. 43, 1304 (2007)
  • 5. W. Paszkowicz, J. Appl. Crystallogr. 20, 166 (1987)
  • 6. V.A. Nikitenko, V.G. Plekhanov, S.V. Mukhin, M.V. Tkachev, J. Appl. Spectrosc. 63, 290 (1996)
  • 7. B.H. Bairamov, A. Heinrich, G. Irmer, V.V. Toporov, E. Ziegler, Phys. Status Solidi B 119, 227 (1983)
  • 8. N. Ashkenov, B.N. Mbenkum, C. Bundesmann, V. Riede, M. Lorenz, D. Spemann, E.M. Kaidashev, A. Kasic, M. Schubert, M. Grundmann, G. Wagner, H. Neumann, V. Darakchieva, H. Arwin, B. Monemar, J. Appl. Phys. 93, 126 (2003)
  • 9. W. Gebicki, K. Osuch, C. Jastrzebski, Z. Golacki, M. Godlewski, Superlattices Microstruct. 38, 428 (2005)
  • 10. Jianfeng Xu, W. Ji, X.B. Wang, H. Shu, Z.X. Shen, S.H. Tang, J. Raman Spectrosc. 29, 613 (1998)
  • 11. R.R. Reeber, J. Appl. Phys. 41, 5063 (1970)g
  • 12. J. Menéndez, M. Cardona, Phys. Rev. B 29, 2051 (1984)
  • 13. M. Balkanski, R.F. Wallis, E. Haro, Phys. Rev. B 28, 1928 (1983)
  • 14. J.M. Calleja, M. Cardona, Phys. Rev. B 16, 3753 (1977)
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv119n532kz
Identifiers
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.