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Abstracts
We investigated single crystals of GaN and thin film GaN radiation detectors by thermally stimulated currents and thermally stimulated depolarization methods in order to characterize carrier transport properties as influenced by material defect structure. In thick GaN no expressed structure of the thermally stimulated current spectra was observed in the temperature range from 100 K up to 350 K, which could be characteristic of the thermal carrier generation from trap levels. The experimental facts imply that the thermally stimulated current spectra might be caused not by carrier generation, but it could be due to thermal mobility changes. Therefore we had applied the numerical analysis by taking into account carrier scattering by ionized impurities and phonons. It was found that mobility limited by ionized impurities varies as T^{2.8} and lattice scattering causes the dependence T^{-3.5}. The highest mobility values were up to 1550 cm^2/(V s) at 148-153 K. Such high values indicate relatively good quality of the single GaN thick crystals. In high resistivity GaN detectors irradiated by high doses of high-energy neutrons and X-rays current instabilities were observed which could be caused by the change of carrier drift paths in a highly disordered matter. A model of carrier percolation transport is presented.
Discipline
- 85.30.De: Semiconductor-device characterization, design, and modeling
- 72.80.Ey: III-V and II-VI semiconductors
- 72.20.Fr: Low-field transport and mobility; piezoresistance
- 78.70.-g: Interactions of particles and radiation with matter
- 72.20.Jv: Charge carriers: generation, recombination, lifetime, and trapping
Journal
Year
Volume
Issue
Pages
340-345
Physical description
Dates
published
2005-02
received
2004-08-22
Contributors
author
- Semiconductor Physics Department and Institute of Materials Science and Applied Research, Vilnius University, Saulėtekio al. 9, bldg. 3, 2040 Vilnius, Lithuania
author
- Semiconductor Physics Department and Institute of Materials Science and Applied Research, Vilnius University, Saulėtekio al. 9, bldg. 3, 2040 Vilnius, Lithuania
author
- Semiconductor Physics Department and Institute of Materials Science and Applied Research, Vilnius University, Saulėtekio al. 9, bldg. 3, 2040 Vilnius, Lithuania
References
- 1. S. Nakamura, T. Mukai, M. Senoh, Appl. Phys. Lett., 64, 1687, 1994
- 2. M. Razeghi, A. Rogalski, J. Appl. Phys., 79, 7433, 1996
- 3. I. Akasaki, H. Amano, Jpn. J. Appl. Phys., 36, 5293, 1997
- 4. G. Kavaliauskiene, V. Kazukauskas, V. Rinkevicius, J. Storasta, J.V. Vaitkus, R. Bates, V. O'Shea, K.M. Smith. Appl. Phys. A, 69, 415, 1999
- 5. J.G. Simmons, G.W. Taylor, Phys. Rev. B, 5, 1619, 1972
- 6. G. Li, S.J. Chua, W. Wang, Solid State Commun., 111, 659, 1999
- 7. T.T. Mnatsakanov, M.E. Levinshtein, L.I. Pomortseva, S.N. Yurkov, G.S. Simin, M. Asif Khan, Solid-State Electron., 47, 111, 2003
- 8. S. Nakamura, T. Mukai, M. Senoh. J. Appl. Phys., 71, 5543, 1992
- 9. D.M. Caughey, R.E. Thomas, Proc IEEE, 55, 2192, 1967
- 10. K. Seeger, Semiconductor Physics. An Introduction, 8th ed., Springer, Berlin 2002
- 11. B.K. Ridley, Quantum Processes in Semiconductors, Clarendon Press, Oxford 1982
- 12. B. Pistoulet, P. Girard, G. Hamamdjian, J. Appl. Phys., 56, 2268 and 2275, 1984
- 13. V. Kazukauskas, J. Appl. Phys., 84, 2053, 1998
- 14. V. Kazukauskas, J. Storasta, J.-V. Vaitkus, J. Appl. Phys., 80, 2269, 1996
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv107n224kz