Temperature effects in contacts between a metal and a semiconductor nanowire near the degenerate doping.
Nanotechnology
; 2018 Feb 09.
Article
en En
| MEDLINE
| ID: mdl-29424703
ABSTRACT
We have investigated the nonlinear conductance in diffusion-doped SiGaAs nanowires contacted by patterned metal films in a wide range of temperatures <i>T</i>. The wire resistance R<sub>W</sub> and the zero bias resistance R<sub>C</sub>, dominated by the contacts, exhibit very different responses to temperature changes. While R<sub>W</sub> shows almost no dependence on <i>T</i>, R<sub>C</sub> varies by several orders of magnitude as the devices are cooled from room temperature to T= 5 K. We develop a model that employs a sharp donor level very low in the GaAs conduction band and show that our observations are consistent with the model predictions. We then demonstrate that such measurements can be used to estimate carrier properties in nanostructured semiconductors and obtain an estimate for N<sub>D</sub>, the doping density in our samples. We also discuss the effects of surface states and dielectric confinement on carrier density in semiconductor nanowires.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Nanotechnology
Año:
2018
Tipo del documento:
Article
País de afiliación:
Estados Unidos