Growth of hexagonal quantum dots under preferential evaporation

Abstract : We perform numerical simulations of hexagonal quantum dots of AlGaN semiconductors. We show that the competition between surface mass diffusion and evaporation rules the morphology of the quantum dots. The system displays three different behaviors: presence of separated islands without a wetting layer, islands dissolving into the wetting layer, or islands that do not evolve. The first behavior is of special interest because its optoelectrical properties are significantly improved in comparison with quantum dots with a wetting layer.
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Guido Schifani, Thomas Frisch, Jean-Noël Aqua. Growth of hexagonal quantum dots under preferential evaporation. Comptes Rendus Mécanique, Elsevier Masson, 2019, 347 (4), pp.376-381. ⟨10.1016/j.crme.2019.03.012⟩. ⟨hal-02147131⟩

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