Nitrogen incorporation and optical studies of GaAsSbN∕GaAs single quantum well heterostructures
Date
2007Source Title
Journal of Applied Physics
Print ISSN
0021-8979
Electronic ISSN
1089-7550
Publisher
A I P Publishing LLC
Volume
102
Issue
5
Pages
053106-1 - 053106-8
Language
English
Type
ArticleItem Usage Stats
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Abstract
In this work, the effects of N incorporation on the optical properties of GaAsSbN/GaAs single quantum wells (SQWs) have been investigated using temperature, excitation, and magnetic dependencies of photoluminescence (PL) characteristics. These layers were grown in an elemental solid source molecular beam epitaxy system with a rf plasma N source. The N concentrations in the range of 0.5%-2.5% were investigated in this study. The SQW with N similar to 0.5% exhibits a behavior similar to that in an intermediate regime where the contributions from the localized states in the band gap are dominant. The temperature and excitation dependencies of the PL characteristics indicate that for the N concentration of 0.9% and above, the alloy behavior is analogous to that of a regular alloy and the changes in optical properties are only marginal. The conduction band effective mass (m(eff)) values computed from the magnetophotoluminescence spectra using a variational formalism and the band anticrossing model are in good agreement and indicate enhanced values of m(eff). However, there is no significant variation in m(eff) values of QWs for N >= 0.9%. Small redshift of about 30-50 meV for the temperature variations from 10 to 300 K in conjunction with unusually small blueshift observed in the excitation dependence of PL for N >= 0.9% indicate that this system holds a great promise for laser applications at 1.55 mu m and beyond.
Keywords
Molecular-beam EpitaxyMbe Growth
Gaas
Photoluminescence
Temperature
Alloys
Gainnassb
Emission