Skip to main content Accessibility help

Exciton Luminescence of Single-Crystal GaN

  • J.R. Müllhaüser (a1), O. Brandt (a1), H. Yang (a1) and K.H. Ploog (a1)


Detailed photoluminescence (PL) studies of high-quality MBE-grown single-crystal cubic and hexagonal GaN are presented. We identify free and bound exciton recombination. By means of a line-shape analysis, we quantitatively analyze our spectra, which were taken as a function of temperature (T = 4 - 300 K) and excitation density (P ex = 0.3 - 200W/cm2). We show the dominant recombination channel at 300 K to be free-excitonic in nature with an internal small-signal quantum efficiency of 6 · 10−3 for both cubic and hexagonal material. Based on a three-level model, activation energies for exciton dissociation are evaluated. Radiative (τrad ≈ 2 ns) and nonradiative lifetimes (τ e ≈ 1μs, τ h ≈ 20 ps) are determined, where in the latter case, electron and hole trapping are considered separately. Furthermore, we show that the dominant nonradiative recombination center, being a hole trap, saturates at P ex ≥ 20 W/cm2.



Hide All
1 Menniger, J., Jahn, U., Brandt, O., Yang, H., Ploog, K.H., Phys. Rev. B, to be published (15.01.96)
2 Ramírez-Flores, G., Navarro-Contreras, H., Lastras-Martínez, A., Phys. Rev. B 50, 8433 (1994)
3 Monemar, B., Phys. Rev. B 10, 676 (1974)
4 Brandt, O., Klann, R., Müllhäuser, J.R., Yang, H., Ploog, K.H., unpublished
5 Brandt, O., Yang, H., Jenichen, B., Suzuki, Y., Däweritz, L., Ploog, K.H., Phys. Rev. B 52, R2253 (1995)
6 Bebb, H.B., Williams, E.W. in Semiconductors and Semimetals Vol. 8. edited by Willardson, R.K., Beer, A.C. (Academic Press, New York and London 1972), pp. 227317
7 Shinada, M., Sugano, S., J. Phys. Soc. Jap. 21, 1936 (1966)
8 O’Donnell, K.P., Chen, X., Appl. Phys. Lett. 58, 2924 (1991)
9 Bimberg, D., Sondergeld, M., Grobe, E., Phys. Rev. B 4, 3451 (1971)
10 Brandt, O., Kanamoto, K., Gotoda, M., Isu, T., Tsukada, N., Phys. Rev. B 51, 7029 (1995)

Exciton Luminescence of Single-Crystal GaN

  • J.R. Müllhaüser (a1), O. Brandt (a1), H. Yang (a1) and K.H. Ploog (a1)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed