Surface relaxation of strained semiconductor heterostructures revealed by finite-element calculations and transmission electron microscopy

Jacob, Damien; Androussi, Y.; Benabbas, T.; François, P.; Lefebvre, Alain

doi:10.1080/01418619808239962

Cited by 14 publications

(1 citation statement)

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“…One can consider the altering of the diameter to be caused by the relaxation of strain induced by the lattice mismatch of the two materials. The lattice relaxes by expanding like it is well known for strained thin foils [16] prepared for TEM investigations. The lattice parameter of cubic ZnTe (a ZnTe = 0.610 nm) and of cubic CdTe (a CdTe = 0.648 nm) cause a mismatch of about 6 %.…”

Section: Resultsmentioning

confidence: 97%

TEM analysis of the container effect of Au‐based catalyst droplets during vapour‐liquid‐solid growth of axial ZnTe/CdTe nanowires

Kirmse¹,

Häusler

Kret

et al. 2009

Cryst. Res. Technol.

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Axial heterostructure nanowires (NWs) of ZnTe/CdTe were grown by vapour-liquid-solid growth realized in a molecular beam epitaxial chamber. By alternative supply of Zn or Cd and constant Te the heterostructure was generated. The liquid phase is provided by a Au-based eutectic droplet which stays at the tip of the NW during the entire growth. For structural and chemical characterization by TEM the NWs were harvested from the substrate and transferred to a holey carbon film. The NWs exhibit an expansion of the diameter correlated with the interface region between ZnTe and CdTe. Idiomorphic growth of the CdTe is evident from electron diffraction experiments. The growth rate of CdTe appears to be smaller compared to that of ZnTe at the same temperature. Both, quantitative high-resolution TEM and energy dispersive X-ray spectroscopy line scans reveal a smeared ZnTe/CdTe interface along about 200 nm. The smearing is due to both, the liquid catalyst which buffers the supply of Cd instead of Zn at the liquid/solid interface and to the strain which is induced by the lattice mismatch. It forces the system to consume the remnant Zn for the NW growth in favour of Cd. Dedicated to Prof. Wolfgang Neumann on the occasion of his 65th birthday

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Section: Resultsmentioning

confidence: 97%