Quantitative reconstructions of 3D chemical nanostructures in nanowires

Pamela Rueda-Fonseca (1) , Eric Robin (2) , Edith Bellet-Amalric (1) , Miguel Lopez-Haro (2) , Martien den Hertog (3) , Yann Genuist (4) , Régis André (5) , Alberto Artioli (5) , Serge Tatarenko (5) , David Ferrand (5) , Joel Cibert (5)

1 NPSC - Nanophysique et Semiconducteurs
2 LEMMA - Laboratoire d'Etude des Matériaux par Microscopie Avancée
3 NEEL - MRS - Matériaux, Rayonnements, Structure
4 NEEL- EpiCM - Epitaxie et couches minces
5 NEEL - NPSC - Nanophysique et Semiconducteurs

Energy dispersive—X-ray spectrometry is used to extract a quantitative 3D composition profile of heterostructured nanowires. The analysis of hypermaps recorded along a limited number of projections, with a preliminary calibration of the signal associated with each element, is compared to the intensity profiles calculated for a model structure with successive shells of circular, elliptic or faceted cross-sections. This discrete tomographic technique is applied to II-VI nanowires grown by molecular beam epitaxy, incorporating ZnTe and CdTe and their alloys with Mn and Mg, with typical size down to a few nanometers and Mn or Mg content as low as 10%.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Pamela Rueda-Fonseca, Eric Robin, Edith Bellet-Amalric, Miguel Lopez-Haro, Martien den Hertog, et al.. Quantitative reconstructions of 3D chemical nanostructures in nanowires. Nano Letters, 2016, 16 (3), pp.1637-1642. ⟨10.1021/acs.nanolett.5b04489⟩. ⟨hal-01274694⟩