Skip to main content Accessibility help
×
Home

Optical Properties and Electroluminescence of Ordered and Disordered ALAS/GAAS Superlattices

  • D. J. Arent (a1), R. G. Alonso (a1), G. S. Horner (a1), A. E. Kibbler (a1), J. M. Olson (a1), X. Yin (a2), M. C. Delong (a2), A. J. Springthorpe (a3), A. Majeed (a3), D. J. Mowbray (a4) and M. S. Skolnick (a4)...

Abstract

In this study, we report the optical properties of a variety of compositionally equivalent disordered superlattices in the AlAs/GaAs system. Markedly different signatures are seen in the steady-state optical signatures of a random pseudobinary A10.5Ga0.5As alloy and (AlAs)n(GaAs)4-n superlattices (SLs) where n = 2 (ordered) or n is randomly chosen (disordered). Relative to the properties of the pseudobinary alloy or ordered SL, intense, redshifted, photoluminescence (PL) peaks and broad non-excitonic absorption are observed from disordered (AlAs)n(GaAs)4-n SLs where n is randomly chosen from the sets [0, 1, 2, 3, 4] or [1, 2, 3]. Our observations suggest that a large density of states at energies lower than the compositionally equivalent pseudobinary band gap exist, and including wider wells and barriers may lead strongly localized regions and the onset of quantum effects. Room temperature electroluminescence is also observed from disordered SL pn samples, and the energy, intensity, and efficiency are shown to vary with deposition sequence.

Copyright

References

Hide All
1. Chomette, A., Deveaud, B., Regreny, A., and Bastard, G., Phys. Rev. Lett. 57, 1464, (1986).
2. See Tuncel, E. and Pavesi, L., Phil. Mag. B. 65, 213 (1992) and references therein.
3. Sasaki, A., Kasu, M., Yamamoto, T., and Noda, S., Jap. J. Appl. Phys. 28, L1249, (1989).
4. Kasu, M., Yamamoto, T., Noda, S. and Sasaki, A., Jap. J. Appl. Phys. 29, 828 (1990).
5. Kasu, M., Yamamoto, T., Noda, S. and Sasaki, A., Jap. J. Appl. Phys. 29, L1055, (1990).
6. Kasu, M., Yamamoto, T., Noda, S., and Sasaki, A., Appl. Phys. Lett. 59, 800 (1991).
7. Kasu, M., Yamamoto, T., Noda, S. and Sasaki, A., Jap. J. Appl. Phys. 29, L1588, (1990)
8. Sasaki, A., J. Cryst. Growth 115,490, (1991)
9. Wang, X-L., Wakahara, A., and Sasaki, A., Appl. Phys. Lett. 62, 888 (1993).
10. Chen, X., Henderson, B., and O'Donnell, K. P., Appl. Phys. Lett. 60, 2672 (1992).
11. Brennan, K. F. Appl. Phys. Lett. 57, 1114 (1990).
12. Su, W. P. and Shih, H.D., J. Appl. Phys. 72, 2080 (1992).
13. Stozier, J., Zhang, Y.A., Horton, C., Ignatiev, A., and Shih, H.D., J. Vac. Sci. Tech. A, 11, 923 (1993).
14. Anderson, P.W., Phys. Rev. 109, 1492 (1958).
15. Grant, J., Menéndez, J., Peiffer, L. N. West, K. W. Molinari, E., and Baroni, S., Appl. Phys. Lett. 59, 2859 (1991).
16. Ge, W., Sturge, M. D. Schmidt, W. D. Pfeiffer, L. N. and West, K. W. Appl. Phys. Lett. 57, 55, (1990).
17. Wei, S.-H. and Zunger, A., J. Appl. Phys. 63,5794 (1988).
18. Mott, N., and Davis, E.A., Electronic Processes in Non-Crystalline Materials. (Clarendon Press, Oxford, 1979).
19. Arent, D. J., Kibbler, A., Kurtz, Sarah R., Olson, J. M. SpringThorpe, A. J. and Majeed, A., unpublished.

Optical Properties and Electroluminescence of Ordered and Disordered ALAS/GAAS Superlattices

  • D. J. Arent (a1), R. G. Alonso (a1), G. S. Horner (a1), A. E. Kibbler (a1), J. M. Olson (a1), X. Yin (a2), M. C. Delong (a2), A. J. Springthorpe (a3), A. Majeed (a3), D. J. Mowbray (a4) and M. S. Skolnick (a4)...

Metrics

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