Physics – Condensed Matter – Materials Science
Scientific paper
2004-07-05
Appl. Phys. Lett. 86, 111906 (2005)
Physics
Condensed Matter
Materials Science
4 pages, 3 figures, 16 refs
Scientific paper
10.1063/1.1885173
We present a systematic study on the exciton relaxation in high purity AlGaAs epilayers. The time for the excitonic photoluminescence to reach its maximum intensity (t_max) shows a non-monotonic dependence on excitation density which is attributed to a competition between exciton localization and carrier-carrier scattering. A phenomenological four level model fully describes the influence of exciton localization on t_max. This localization effect is enhanced by the increase of the Al content in the alloy and disappears when localization is hindered by rising the lattice temperature above the exciton trapping energy.
Amo Alberto
Klopotowski Lukasz
Martin Daniel M.
Toropov Aleksandr I.
Vina L.
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