Related Experiment Video
Updated: Jan 22, 2026

Analysis of Contact Interfaces for Single GaN Nanowire Devices
Published on: November 15, 2013
Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell Nanowires
Lars Nicolai1, Žarko Gačević2, Enrique Calleja2
1Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5-7, 10117, Berlin, Germany. nicolai@pdi-berlin.de.
Abstract:
The three-dimensional structure of GaN/(In,Ga)N core-shell nanowires with multi-faceted pencil-shaped apex is analyzed by electron tomography using high-angle annular dark-field mode in a scanning transmission electron microscope. Selective area growth on GaN-on-sapphire templates using a patterned mask is performed by molecular beam epitaxy to obtain ordered arrays of uniform nanowires. Our results of the tomographic reconstruction allow the detailed determination of the complex morphology of the inner (In,Ga)N multi-faceted shell structure and its deviation from the perfect hexagonal symmetry. The tomogram unambiguously identifies a dot-in-a-wire configuration at the nanowire apex including the exact shape and size, as well as the spatial distribution of its chemical composition.
More Related Videos
Related Concept Videos
Molecular Shape and Polarity
The Nucleosome Core Particle
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
VSEPR Theory and the Basic Shapes
Electron Microscope Tomography and Single-particle Reconstruction
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Molecular Shapes
Two regions of electron density in a diatomic...
Electron Configuration of Multielectron Atoms

