Identification of donors in GaAs by resonantly excited high-field magnetospectroscopy

Brian Skromme, Rajaram Bhat, Herbert M. Cox, Etienne Colas

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The use of magnetospectroscopy of donor-bound excitons in the low-temperature (1.7 K) photoluminescence spectrum of GaAs for the identification of shallow donor species in low-doped epitaxial GaAs is described. The selective excitation of individual donor species in excited final-state (2p-, 2p0) transitions by tuning a dye laser into resonance with a corresponding component of the principal neutral donor-bound exciton lines is discussed. Under these resonant conditions, the sensitivity to low-level contaminants is considerably improved. In addition, a better than 2× reduction in linewidth can be obtained, using a suitably narrowed laser line. Individual components of the principal neutral donor-bound exciton peaks corresponding to different donor species are directly resolved in luminescence for the first time. The separation between these components, which has generally been neglected in past studies, is shown to account for the differences in the (1s-2p-) excitation energies observed in comparison to the far-infared measurements. Individual donors are also resolved in the ionized donor-bound excitation peaks, and Haynes' rule relationships are determined for both neutral and ionized donor-bound excitons.

Original languageEnglish (US)
Pages (from-to)1035-1045
Number of pages11
JournalIEEE Journal of Quantum Electronics
Volume25
Issue number5 pt 1
DOIs
StatePublished - May 1989
Externally publishedYes

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Excitons
excitons
excitation
Dye lasers
Excitation energy
dye lasers
Linewidth
contaminants
Luminescence
Photoluminescence
Tuning
tuning
Impurities
luminescence
photoluminescence
Lasers
sensitivity
lasers
Temperature
energy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Identification of donors in GaAs by resonantly excited high-field magnetospectroscopy. / Skromme, Brian; Bhat, Rajaram; Cox, Herbert M.; Colas, Etienne.

In: IEEE Journal of Quantum Electronics, Vol. 25, No. 5 pt 1, 05.1989, p. 1035-1045.

Research output: Contribution to journalArticle

Skromme, Brian ; Bhat, Rajaram ; Cox, Herbert M. ; Colas, Etienne. / Identification of donors in GaAs by resonantly excited high-field magnetospectroscopy. In: IEEE Journal of Quantum Electronics. 1989 ; Vol. 25, No. 5 pt 1. pp. 1035-1045.
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