Details

Autor(en) / Beteiligte

• Zeng, Lunjie
• Gammer, Christoph
• Ozdol, Burak
• Nordqvist, Thomas
• Nygård, Jesper
• Krogstrup, Peter
• Minor, Andrew M.
• Jäger, Wolfgang
• Olsson, Eva

Titel

Correlation between Electrical Transport and Nanoscale Strain in InAs/In0.6Ga0.4As Core–Shell Nanowires

Ist Teil von

• Nano letters, 2018-08, Vol.18 (8), p.4949-4956

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Free-standing semiconductor nanowires constitute an ideal material system for the direct manipulation of electrical and optical properties by strain engineering. In this study, we present a direct quantitative correlation between electrical conductivity and nanoscale lattice strain of individual InAs nanowires passivated with a thin epitaxial In0.6Ga0.4As shell. With an in situ electron microscopy electromechanical testing technique, we show that the piezoresistive response of the nanowires is greatly enhanced compared to bulk InAs, and that uniaxial elastic strain leads to increased conductivity, which can be explained by a strain-induced reduction in the band gap. In addition, we observe inhomogeneity in strain distribution, which could have a reverse effect on the conductivity by increasing the scattering of charge carriers. These results provide a direct correlation of nanoscale mechanical strain and electrical transport properties in free-standing nanostructures.