Direct imaging of single Au atoms within GaAs nanowires.
basic_science · Level V
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- Record sourced from PubMed, PMID 22497234.
- Also identified by DOI 10.1021/nl300314k.
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Abstract
Incorporation of catalyst atoms during the growth process of semiconductor nanowires reduces the electron mean free path and degrades their electronic properties. Aberration-corrected scanning transmission electron microscopy (STEM) is now capable of directly imaging single Au atoms within the dense matrix of a GaAs crystal, by slightly tilting the GaAs lattice planes with respect to the incident electron beam. Au doping values in the order of 10(17-18) cm(3) were measured, making ballistic transport through the nanowires practically inaccessible.