Source: http://aoot.osa.org/oe/abstract.cfm?uri=oe-25-26-33243
Timestamp: 2019-04-26 06:28:07+00:00

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Porous GaN and (Ga,In)N/GaN single quantum well layers are fabricated using a selective area sublimation (SAS) technique from initially smooth and compact 2-dimensional (D) layers grown on Si(111) or c-plane sapphire substrates. The photoluminescence properties of these porous layers are measured and compared to reference non-porous samples. Whatever the substrate used, the porosity leads to an increase of the room temperature photoluminescence intensity. The magnitude of this increase is related to the initial defect density of the 2D epitaxial layers and to the degree of carrier localization prior to the SAS process.
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Fig. 1 Structure of the samples.
Fig. 2 Scanning electron microscopy in plane-views of samples p-A (a), p-B (b), and p-C (c). Cross-section image of sample p-B (d).
Fig. 3 Room temperature photoluminescence spectra of samples A, p-A, B and p-B.
Fig. 4 (a) Room temperature photoluminescence of samples C and p-C. (b) Comparison of the room temperature photoluminescence of sample p-A and p-C (log. scale).
Fig. 5 (a) Temperature dependence of the photoluminescence spectra of sample p-B. (b) Arrhenius plot of the integrated photoluminescence intensity of the (Ga,In)N quantum well of sample p-B. A non-radiative process corresponding to an activation energy of 46 meV is found.

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