3 years ago

In-situ passivation of GaAsP nanowires.

Laurant Travers, Maria Tchenycheva, Fabrice Oehler, Chalermchai Himwas, Pierre Rale, Nicolas Chauvin, Gilles Patriarche, Stéphane Collin, Jean-Christophe Harmand, François Julien
We report on the structural and optical properties of GaAsP nanowires (NWs) grown by molecular-beam epitaxy. By adjusting the alloy composition in the NWs, the transition energy was tuned to the optimal value required for tandem III-V/silicon solar cells. We discovered that an unintentional shell was also formed during the GaAsP NW growth. The NW surface was passivated by an in-situ deposition of a radial Ga(As)P shell. Different shell compositions and thicknesses were investigated. We demonstrate that the optimal passivation conditions for GaAsP NWs (with a gap of 1.78 eV) are obtained with a 5 nm-thick GaP shell. This passivation enhances the luminescence intensity of the NWs by 2 orders of magnitude and yields a longer luminescence decay. The luminescence dynamics changes from single exponential decay with a 4 ps characteristic time in non-passivated NWs to a bi-exponential decay with characteristic times of 85 ps and 540 ps in NWs with GaP shell passivation.

Publisher URL: http://doi.org/10.1088/1361-6528/aa9533

DOI: 10.1088/1361-6528/aa9533

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