Well-width and aluminum-concentration dependence of the exciton binding energies in GaAs/AlxGa1-xAs quantum wells

Massimo Gurioli, Juan Martinez-Pastor, Marcello Colocci, A. Bosacchi, Secondo Franchi, Lucio Claudio Andreani

Research output: Contribution to journalArticle

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Abstract

A photoluminescence-excitation (PLE) study of the exciton binding energy in GaAs/AlxGa1-xAs quantum-well (QW) structures is reported. A line-shape fit of the PLE spectra, based on a correct evaluation of the absorption probability in QW's, is proposed as a powerful tool in order to deduce accurately the exciton binding energies even in samples where the 2s peak is unresolved. The experimental results obtained are in good agreement with recent accurate theories. In particular, we find a strong dependence of the heavy-hole exciton binding energy E1 on the aluminum concentration of the AlxGa1-xAs barrier, in agreement with the predicted importance of the dielectric mismatch and conduction-band nonparabolicity in enhancing E1. Finally, evidence of exciton binding energies larger than the two-dimensional limit in GaAs is found even in relatively thick QW's (50) with AlAs barriers.

Original languageEnglish
Pages (from-to)15755-15762
Number of pages8
JournalPhysical Review B
Volume47
Issue number23
DOIs
Publication statusPublished - 1993

Fingerprint

Binding energy
Aluminum
Excitons
Semiconductor quantum wells
binding energy
excitons
quantum wells
aluminum
Photoluminescence
photoluminescence
Conduction bands
excitation
line shape
conduction bands
LDS 751
gallium arsenide
evaluation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Well-width and aluminum-concentration dependence of the exciton binding energies in GaAs/AlxGa1-xAs quantum wells. / Gurioli, Massimo; Martinez-Pastor, Juan; Colocci, Marcello; Bosacchi, A.; Franchi, Secondo; Andreani, Lucio Claudio.

In: Physical Review B, Vol. 47, No. 23, 1993, p. 15755-15762.

Research output: Contribution to journalArticle

Gurioli, Massimo ; Martinez-Pastor, Juan ; Colocci, Marcello ; Bosacchi, A. ; Franchi, Secondo ; Andreani, Lucio Claudio. / Well-width and aluminum-concentration dependence of the exciton binding energies in GaAs/AlxGa1-xAs quantum wells. In: Physical Review B. 1993 ; Vol. 47, No. 23. pp. 15755-15762.
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AU - Franchi, Secondo

AU - Andreani, Lucio Claudio

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