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Sb and N Incorporation Interplay in GaAsSbN/GaAs Epilayers near Lattice-Matching Condition for 1.0–1.16-eV Photonic Applications

Authors :
V. Braza
D. F. Reyes
A. Gonzalo
A. D. Utrilla
T. Ben
J. M. Ulloa
D. González
Source :
Nanoscale Research Letters, Vol 12, Iss 1, Pp 1-10 (2017)
Publication Year :
2017
Publisher :
SpringerOpen, 2017.

Abstract

Abstract As promising candidates for solar cell and photodetection applications in the range 1.0–1.16 eV, the growth of dilute nitride GaAsSbN alloys lattice matched to GaAs is studied. With this aim, we have taken advantage of the temperature gradient in the molecular beam epitaxy reactor to analyse the impact of temperature on the incorporation of Sb and N species according to the wafer radial composition gradients. The results from the combination of X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopies (EDS) show an opposite rate of incorporation between N and Sb as we move away from the centre of the wafer. A competitive behaviour between Sb and N in order to occupy the group-V position is observed that depends on the growth rate and the substrate temperature. The optical properties obtained by photoluminescence are discussed in the frame of the double-band anticrossing model. The growth conditions define two sets of different parameters for the energy level and the coupling interaction potential of N, which must be taken into account in the search for the optimum compositions 1–1.15-eV photonic applications.

Details

Language :
English
ISSN :
19317573 and 1556276X
Volume :
12
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Nanoscale Research Letters
Publication Type :
Academic Journal
Accession number :
edsdoj.7b6374c4ae7c4082b332b90ecadb15e2
Document Type :
article
Full Text :
https://doi.org/10.1186/s11671-017-2129-2