The Effect of Bending Deformation on Charge Transport and Electron Effective Mass of p-doped GaAs Nanowires
Introductory text in journal, 2019

The crystal and electronic structure of semiconductor nanowire systems have shown sensitive response to mechanical strain, enabling novel and improved electrical, and optoelectrical properties in nanowires by strain engineering. Here, the response of current–voltage (I–V) characteristics and band structure of individual p-doped GaAs nanowires to bending deformation is studied by in situ electron microscopy combined with theoretical simulations. The I–V characteristics of the nanowire change from linear to nonlinear as bending deformation is applied. The nonlinearity increases with strain. As opposed to the case of uniaxial strain in GaAs, the bending deformation does not give rise to a change in the band gap of GaAs nanowire according to in situ electron energy loss spectroscopy (EELS) measurements. Instead, the response to bending deformation can be explained by strain induced valence band shift, which results in an energy barrier for charge carrier transport along the nanowire. Moreover, the electron effective mass decreases as the strain changes from compressive to tensile across the GaAs nanowire in the bent region. Results from this study shed light on the complex interplay between lattice strain, band structure, and charge transport in semiconductor nanomaterials.

band structure

GaAs nanowires

charge transport

strain engineering

bending deformation

Author

Lunjie Zeng

Chalmers, Physics, Eva Olsson Group

T. Kanne

Niels Bohr Institute

J. Nygard

Niels Bohr Institute

P. Krogstrup

Wolfgang Jäger

University of Kiel

Eva Olsson

Chalmers, Physics, Eva Olsson Group

Physica Status Solidi - Rapid Research Letetrs

1862-6254 (ISSN) 1862-6270 (eISSN)

Vol. 13 8 1900134

Enabling Science and Technology through European Electron Microscopy (ESTEEM 2)

European Commission (FP7), 2012-10-01 -- 2016-09-30.

In Situ transmissionselektronmikroskopi studier av inverkan av mekanisk töjning hos halvledande nanotrådar

Swedish Research Council (VR), 2017-01-01 -- 2020-12-31.

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Energy

Subject Categories

Atom and Molecular Physics and Optics

Theoretical Chemistry

Condensed Matter Physics

DOI

10.1002/pssr.201900134

More information

Latest update

12/4/2019