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Photoluminescence Excitation Dependence in Three-dimensional Si/SiGe Nanostructures

  • Eun-Kyu Lee (a1), Boris V. Kamenev (a2), Theodore I. Kamins (a3), Jean-Marc Baribeau (a4), David J. Lockwood (a5) and Leonid Tsybeskov (a6)...


We find that in SiGe clusters grown on Si using Stranski-Krastanov (S-K) growth mode, (i) photoluminescence (PL) spectra, (ii) PL lifetime and (iii) PL thermal quench activation energies exhibit strong dependence on the excitation intensity. Under PL excitation intensity increasing from 1 to 104 W/cm2, the PL spectra exhibit blue shift from below Ge bandgap up to ∼970 meV. The PL lifetime shows strong dependence on the excitation wavelength, decreasing from 20 μs at ∼0.8 eV to 200 ns at ∼ 0.9 eV. The process of PL thermal quench has two clearly distinguished activation energies. At low temperature, small (∼15 meV) and excitation-independent activation energy is attributed to exciton thermal dissociation. At higher temperature, excitation-dependent PL thermal quench activation energy (increasing from ∼ 120 to 340 meV as excitation intensity increases) is found, and it is attributed to hole redistribution via tunneling and/or thermal ionization over the Si/SiGe valence band energy barrier.



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1. Shiraki, Y., Sunamura, H., Usami, N., and Fukatsu, S., Appl. Surf. Sci. 102, 263 (1996).
2. Kamenev, B. V., Lee, E.-K., Chang, H.-Y., Han, H., Grebel, H., Tsybeskov, L., and Kamins, T. I., Appl. Phys. Lett. 89, 153106 (2006).
3. Kamenev, B. V., Tsybeskov, L., Baribeau, J.-M, and Lockwood, D. J., Phys. Rev. B 72, 193306 (2005).
4. Lenchyshyn, L. C., Thewalts, M. L. W., Sturm, J. C., Schwartz, P. V., Prinz, E. J., Rowell, N. L., Noël, J.-P., and Houghton, D. C., Appl. Phys. Lett. 60, 3174 (1992).
5. Iyer, S. S., Xie, Y.-H., Science 260, 40 (1993).
6. Thewalt, M. L. W., Harrison, D. A., Reinhart, C. F., Wolk, J. A., Lafontaine, H., Phys. Rev. Lett. 79, 2 (1997).
7. Shmidt, O. G., Lange, C., and Eberl, K., Appl. Phys. Lett. 75, 1905 (1999).
8. Wan, J., Jin, G. L., Jiang, Z. M., Luo, Y. H., Liu, J. L., and Wang, K. L., Appl. Phys. Lett. 78, 1763 (2001).
9. Weber, J., and Alonso, M. I., Phys. Rev. B 40, 5683 (1989).
10. Lautenschlager, P., Allen, P. B., and Cardona, M., Phys. Rev. B 31, 2163 (1985).
11. Fukatsu, S., Sunamura, H., Shiraki, Y., and Komiyama, S., Appl. Phys. Lett. 71, 258 (1997).



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