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Radiative Versus Nonradiative Decay Processes in Germanium Nanocrystals Probed by Time-resolved Photoluminescence Spectroscopy

  • P. K. Giri (a1), R. Kesavamoorthy (a2), B. K. Panigrahi (a2) and K.G.M. Nair (a2)

Abstract

Ge nanocrystals (NCs) of diameter 4–13 nm are grown embedded in a thermally grown SiO2 layer by Ge ion implantation and subsequent annealing. Steady state and time-resolved photoluminescence (PL) studies are performed on these embedded Ge nanocrystals to understand the origin of the PL emission at room temperature. Steady state PL spectra show a broad peak consisting of a peak at ∼2.1 eV originating from Ge NCs and another peak at ∼2.3 eV arising from ion-beam induced defects in the Ge/SiO2 interface. Time-resolved PL studies reveal double exponential decay dynamics of the PL emission on the nanoseconds time scale. The faster component of the decay with large amplitude and having a time constant τ1∼3.1 ns is attributed to the nonradiative lifetime, since the time constant reduces with increasing defect density. The slower component with time constant τ2∼10 ns is attributed to radiative recombination at the Ge NCs. These results are in close agreement with the theoretically predicted radiative lifetime for small Ge NCs.

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1 Kovalev, D., Heckler, H., Ben-Chorin, M., Polisski, G., Schwartzkopff, M., Koch, F., Phys. Rev. Lett. 81, 2803 (1998).
2 Garcia, C., Garrido, B., Pellegrino, P., Ferre, R., Moreno, J.A., Morante, J. R., Pavesi, L., Cazzanelli, M., Appl. Phys. Lett. 82, 1595 (2003).
3 Bostedt, C. and Burren, T. van, Willey, T. M., Franco, N., Terminello, L. J., Heske, C., Moller, T., Appl. Phys. Lett. 84, 4056 (2004).
4 Heath, J. R., Shiang, J. J., Alivisatos, A. P., J. Chem. Phys. 101, 1607 (1994).
5 Weissker, H.-Ch., Furthmüller, J., Bechstedt, F., Phys. Rev. B 65, 155327 (2002); ibid., Phys. Rev. B 65, 155328 (2002).
6 Maeda, Y., Phys. Rev. B 51, 1658 (1995).
7 Zhang, J., Bao, X., Ye, Y., Tan, X., Appl. Phys. Lett. 73, 1790 (1998).
8 Min, K. S., Shcheglov, K. V., Yang, C. M., Atwater, H. A., Brongersma, M. L., Polman, A., Appl. Phys. Lett. 68, (1996) 2511.
9 Wu, X. L., Gao, T., Siu, G. G., Tong, S., Bao, X. M., Appl. Phys. Lett. 74, (1999) 2420.
10 Takeoka, S., Fujii, M., Hayashi, S., Yamamoto, K., Phys. Rev. B 58, 7921 (1998).
11 Takeoka, S., Fujii, M., Hayashi, S., Yamamoto, K., Appl. Phys. Lett. 74, 1558 (1999).
12 Niquet, Y. M., Allan, G., Dellerue, C., Lanoo, M., Appl. Phys. Lett. 77, 1182 (2000).
13 Dovrat, M., Goshen, Y., Jedrzejewski, J., Balberg, I., Sa'ar, A., Phys. Rev. B 69, 155311 (2004).
14 Weissker, H.-Ch., Furthmuller, J., Bechstedt, F., Phys. Rev. B 69, 115310 (2004); ibid., Phys. Rev. B 67, 245304 (2003).
15 Giri, P. K., Kesavamoorthy, R., Panigrahi, B. K., Nair, K. G. M., (Unpublished).
16 Kim, H. B., Chae, K. H., Whang, C. N., Jeong, J. Y., Oh, M. S., Im, S., Song, J. H., J. Lumin. 80, 281 (1999).
17 Singh, Jasprit, Optoelectronics: An introduction to materials and devices, McGraw-Hill, 1996, Chap 5.

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Radiative Versus Nonradiative Decay Processes in Germanium Nanocrystals Probed by Time-resolved Photoluminescence Spectroscopy

  • P. K. Giri (a1), R. Kesavamoorthy (a2), B. K. Panigrahi (a2) and K.G.M. Nair (a2)

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