DP Seminar

[Luca Ferialdi]

Department of Physics - University of Trieste

Wednesday 6 April 2011 - 3.00 pm
Room 204 (2nd floor LB)

Dr. Nahid Ghaderi
(University of Trieste, Theory at Elettra Group,
IOM-CNR, Trieste, Italy)

Title: Semiconductor nanowires: structural and electronic properties from first-principles calculations

Abstract:
Semiconductor nanowires (NWs) offer nowadays new perspectives for
nanoelectronic devices. High- quality NWs  can be experimentally grown:
they are regularly shaped and nicely oriented, with wurzite (WZ) or
zincblende (ZB) structure depending on the substrate and on the growth
conditions.
Radial heterostructures, obtained depositing radially another
semiconductor (shell) on a semiconductor NW (core), offer the possibility
of further engineering their electronic properties by varying their
geometric parameters.
After  discussing  the relative stability of pure ZB and WZ GaAs NWs, we
extensively discuss the energetics of  radial NWs made of InAs and GaAs
with different core-shell composition, structure,  thickness, shape,
interfaces and exposed surfaces. We also discuss the most relevant
electronic structure properties.