Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-03T08:36:47.718Z Has data issue: false hasContentIssue false
  • English
  • Français

Radiative And Nonradiative Relaxation Of Excitons In GaN

Published online by Cambridge University Press:  10 February 2011

A. Göldner ,
L. Eckey ,
A. Hoffmann ,
I. Broser ,
A. Alemu ,
B. Gil ,
S. Ruffenach-Clur ,
R. L. Aulombard  and
O. Briot
A. Göldner
Affiliation:
Institut für Festkörperphysik, Sekr. PN 5-1, Technische Universität Berlin, 10623 Berlin, [email protected]
L. Eckey
Affiliation:
Institut für Festkörperphysik, Sekr. PN 5-1, Technische Universität Berlin, 10623 Berlin, [email protected]
A. Hoffmann
Affiliation:
Institut für Festkörperphysik, Sekr. PN 5-1, Technische Universität Berlin, 10623 Berlin, [email protected]
I. Broser
Affiliation:
Institut für Festkörperphysik, Sekr. PN 5-1, Technische Universität Berlin, 10623 Berlin, [email protected]
A. Alemu
Affiliation:
Groupe d'Etude des Semiconducteurs, Case Courrier 074, Université Montpellier II
B. Gil
Affiliation:
Groupe d'Etude des Semiconducteurs, Case Courrier 074, Université Montpellier II
S. Ruffenach-Clur
Affiliation:
Groupe d'Etude des Semiconducteurs, Case Courrier 074, Université Montpellier II
R. L. Aulombard
Affiliation:
Groupe d'Etude des Semiconducteurs, Case Courrier 074, Université Montpellier II
O. Briot
Affiliation:
Groupe d'Etude des Semiconducteurs, Case Courrier 074, Université Montpellier II
Get access

Abstract

We report on investigations of the excitonic quantum efficiency in GaN epilayers as function of buffer layer thickness, buffer layer material, sample thickness and residual oxygen content. These values are compared to that of GaN bulk material. The quantum efficiency of the free excitons rises with increasing buffer layer thickness, increasing sample thickness and decreasing residual oxygen content. The influence of oxygen on the quantum efficiency is stronger than that of the buffer layer thickness. Additionally, the homoepitaxial growth of GaN shows higher quantum efficiencies than the growth with an AIN buffer layer. In general, the observed quantum efficiencies in GaN epilayers are below 20% indicating the strong impact of nonradiative relaxation and recombination processes in the excitonic range. Only, GaN bulk material shows quantum efficiencies of 25 % for the free A-exciton XA and of 50 % for the donor-bound exciton complex D0,X).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 482 , 1997 , 637
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Nakamura, S., Senoh, M., Nagahama, S., Iwasa, N., Yamada, T., Matsushita, T., Kiyoku, H., and Sugimoto, Y., Jpn. J. Appl. Phys. 35, L 74 (1996).Google Scholar
2. Podlowski, L., Hoffmann, A., and Broser, I., J. Cryst. Growth 117, p. 698 (1992).Google Scholar
3. Briot, O., Gil, B., Sanchez, S., and Aulombard, R. L., Inst. Physics Conf. Ser. 142, p. 891 (1996).Google Scholar
4. Eckey, L., Podlowski, L., Göldner, A., Hoffmann, A., Broser, I., Meyer, B.K., Volm, D., Strehl, T., Hiramatsu, K., Detchprohm, T., Amano, H., Akasaki, I., IOP Publishing Lim., Techno House 142, p. 943 (1995).Google Scholar
5. Lummer, B., Heitz, R., Kutzer, V., Wagner, J.-M., Hoffmann, A., and Broser, I., Phys. Stat. Sol. (B) 188, p. 493 (1995).Google Scholar
6. Amano, H., Sawaki, N., Akasaki, I., Toyoda, Y., Appl. Phys. Lett. 48, p. 353 (1986).Google Scholar
7. Rashba, E. I., Gurgenishvili, G. E., Soy. Phys. Sol. State 4, p. 759 (1962).Google Scholar