Correlated optical and structural analyses of individual GaAsP/GaP core–shell nanowires

Abstract : We report on the structural and optical properties of GaAs 0.7 P 0.3 /GaP core-shell nanowires (NWs) for future photovoltaic applications. The NWs are grown by self-catalyzed molecular beam epitaxy. Scanning transmission electron microscopy (STEM) analyses demonstrate that the GaAsP NW core develops an inverse-tapered shape with a formation of an unintentional GaAsP shell having a lower P content. Without surface passivation, this unintentional shell produces no luminescence because of a strong surface recombination. However, passivation of the surface with a GaP shell leads to appearance of a secondary peak in the luminescence spectrum arising from this unintentional shell. The attribution of the luminescence peaks is confirmed by correlated cathodoluminescence and STEM analyses of the same NW.
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Submitted on : Tuesday, November 5, 2019 - 5:56:00 PM
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Charlermchai Himwas, Stéphane Collin, Hung-Ling Chen, Gilles Patriarche, Fabrice Oehler, et al.. Correlated optical and structural analyses of individual GaAsP/GaP core–shell nanowires. Nanotechnology, Institute of Physics, 2019, 30 (30), pp.304001. ⟨10.1088/1361-6528/ab1760⟩. ⟨hal-02349741⟩

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