Nanowire growth and sublimation: CdTe quantum dots in ZnTe nanowires

Marta Orrù 1, 2 Eric Robin 3 Martien Den Hertog 4 Kimon Moratis 1, 5 Yann Genuist 6 Régis André 1 David Ferrand 1 Joel Cibert 1 Edith Bellet-Amalric 2
2 NPSC - Nanophysique et Semiconducteurs
PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/INAC/PHELIQS
3 LEMMA - Laboratoire d'Etude des Matériaux par Microscopie Avancée
MEM - Modélisation et Exploration des Matériaux : DRF/INAC/MEM
5 LSIM - Laboratory of Atomistic Simulation
MEM - Modélisation et Exploration des Matériaux : DRF/INAC/MEM
6 EpiCM - Epitaxie et couches minces
NEEL - Institut Néel
Abstract : The role of the sublimation of the compound and of the evaporation of the constituents from the gold nanoparticle during the growth of semiconductor nanowires is exemplified with CdTe-ZnTe heterostructures. Operating close to the upper temperature limit strongly reduces the amount of Cd present in the gold nanoparticle and the density of adatoms on the nanowire sidewalls. As a result, the growth rate is small and strongly temperature dependent, but a good control of the growth conditions allows the incorporation of quantum dots in nanowires with sharp interfaces and adjustable shape, and it minimizes the radial growth and the subsequent formation of additional CdTe clusters on the nanowire sidewalls, as confirmed by photoluminescence. Uncapped CdTe segments dissolve into the gold nanoparticle when interrupting the flux, giving rise to a bulb-like (pendant-droplet) shape attributed to the Kirkendall effect.
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Submitted on : Friday, April 13, 2018 - 8:31:21 AM
Last modification on : Thursday, April 4, 2019 - 5:08:04 PM

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Marta Orrù, Eric Robin, Martien Den Hertog, Kimon Moratis, Yann Genuist, et al.. Nanowire growth and sublimation: CdTe quantum dots in ZnTe nanowires. Physical Review Materials, American Physical Society, 2018, 2, pp.043404. ⟨10.1103/PhysRevMaterials.2.043404⟩. ⟨hal-01744170⟩

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