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Role of ionized nitrogen species in the optical and structural properties of GaInNAs/GaAs quantum wells grown by plasma-assisted molecular beam epitaxy
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10.1063/1.2733740
/content/aip/journal/jap/101/10/10.1063/1.2733740
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/10/10.1063/1.2733740
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Room temperature PL spectra of the GaInNAs QWs grown with high (dashed solid line) and low (black solid line) ion densities. The latter shows an improvement of PL intensity by a factor of 4.

Image of FIG. 2.
FIG. 2.

Low temperature (12 K) CL mappings of the GaInNAs QWs grown with a high (a) and low (b) ion densities. The detection energies were 0.933 and 0.943 eV, respectively, which corresponds to the high-energy flank of the respective CL spectra.

Image of FIG. 3.
FIG. 3.

Line scans of the low temperature (12 K) CL intensity of the GaInNAs QWs grown with a high (dashed line) and low (solid line) ion density. The detection energies were 0.933 and 0.943 eV, respectively.

Image of FIG. 4.
FIG. 4.

AFM images of the GaInNAs epilayers, grown with a high [(a),(c)] and a low [(b),(d)] ion density. (a) and (b) scans are with a vertical scale of 3 nm. (c) and (d) scans are with a vertical scale of 5 nm.

Image of FIG. 5.
FIG. 5.

(a) Surface line profiles of the GaInNAs epilayers, measured by AFM. The dashed (solid) line shows the epilayer grown with a high (low) ion density. (b) Fast-Fourier transform of the average of several cross-sectional profiles of the epilayers grown with a high (filled squares) and a low (hollow circles) ion density. Lines are interpolations between data points.

Image of FIG. 6.
FIG. 6.

Cross-sectional TEM image of the GaInNAs QWs grown without (a) and with (b) a deflecting magnetic field to reduce ion density, taken with diffraction vector (002), which is sensitive to the composition of the layer. The insets show in more detail the microstructure of the QWs. The black and white arrows indicate the compositional fluctuations and the growth direction, respectively.

Image of FIG. 7.
FIG. 7.

High-resolution TEM picture of the GaInNAs QW grown with reduced ion density. Upper and lower interfaces are indistinguishable.

Image of FIG. 8.
FIG. 8.

(a) Temperature dependence of the PL peak energy for the sample grown with high (filled squares) and low (hollow circles) ion densities. Solid and dashed lines are -spline interpolations drawn as a guide for the eye. Dash-dot lines are fittings to the experimental data using Varshni model. (b) Temperature dependence of the PL FWHM from the GaInNAs QWs with high (filled squares) and low (hollow circles) ion densities. Solid and dashed lines are interpolations drawn as a guide for the eye.

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/content/aip/journal/jap/101/10/10.1063/1.2733740
2007-05-25
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Role of ionized nitrogen species in the optical and structural properties of GaInNAs/GaAs quantum wells grown by plasma-assisted molecular beam epitaxy
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/10/10.1063/1.2733740
10.1063/1.2733740
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