Influence of ultra-thin AlAs barriers on the optical properties of GaAs/AlGaAs quantum-well structures

Marcello Colocci; Massimo Gurioli; Jose A. Martinez-Lozano; Bruno Chastaingt; C. Deparis; Gerard Neu; J. Massies

doi:10.1117/12.162808

19 November 1993 Influence of ultra-thin AlAs barriers on the optical properties of GaAs/AlGaAs quantum-well structures

Marcello Colocci, Massimo Gurioli, Jose A. Martinez-Lozano, Bruno Chastaingt, C. Deparis, Gerard Neu, J. Massies

Proceedings Volume 1985, Physical Concepts and Materials for Novel Optoelectronic Device Applications II; (1993) https://doi.org/10.1117/12.162808
Event: Physical Concepts of Materials for Novel Optoelectronic Device Applications II, 1993, Trieste, Italy

Abstract

The optical properties of AlGaAs/AlAs/GaAs double barrier quantum well (DBQW) structures, obtained by the insertion of ultra-thin barriers of AlAs between the Al_xGa_1-xAs alloy and the GaAs wells, are investigated by means of continuous-wave and time-resolved photoluminescence techniques. Particular attention is devoted to the structure of the electronic states and to the recombination lifetime of the photoexcited carriers. We demonstrate the usefulness of this novel type of heterostructure as a further degree of freedom toward a tailoring of the band edges in GaAs/AlGaAs QW systems and also for the study of the carrier dynamics in the limit of very shallow subbands. Clear evidence of the transitions between 2D - 3D exciton behavior and between type I - type II recombinations are found depending on the thickness of GaAs and AlAs layers.

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Marcello Colocci, Massimo Gurioli, Jose A. Martinez-Lozano, Bruno Chastaingt, C. Deparis, Gerard Neu, and J. Massies "Influence of ultra-thin AlAs barriers on the optical properties of GaAs/AlGaAs quantum-well structures", Proc. SPIE 1985, Physical Concepts and Materials for Novel Optoelectronic Device Applications II, (19 November 1993); https://doi.org/10.1117/12.162808

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