Transmission electron microscopy characterization of GaN nanowires

Defects, Structure and Properties of Gan Nanowires and Fib-pt/gan Nanowire Contacts: a Transmission Electron Microscopy Study

ACKNOWLEDGEMENTS None of this work would have ever materialized without the involvement of several key persons near the start of my Penn career. I was still a freshman in the spring of 2002 when Prof. John (Jack) Fischer gave me a TEM project on GaAs nanowires and a chance to work alongside the ever-jovial Robert Barsotti. That summer I turned up at the office of Dr. Doug Yates in the Edison bu...

Transmission electron microscopy studies of GaN gamma-LiAlO2 heterostructures

In this work the structure of (1100)M-plane GaN epitaxially grown on γ-LiAlO2(100) by using plasmaassisted molecular beam epitaxy (PAMBE) is studied. The heteroepitaxial alignment and the microstructure of M-plane GaN as well as the defect formation in the layer are systematically investigated by using transmission electron microscopy (TEM). GaN is well known as optoelectronic material which co...

Structural Characterization of Homoepitaxial Blue GaInN/GaN Light-Emitting Diodes by Transmission Electron Microscopy

We perform a transmission electron microscopy (TEM) characterization of blue light-emitting diode epiwafers grown homoepitaxially on a c-plane GaN substrate and compare with such grown on sapphire. We find a threading dislocation (TD) density as low as 2 · 10 cm in homoepitaxial growth, which is 1/30 of that in sapphire-based material. A unique type of inverted pyramid defect with diameter 650 ...

Scanning Transmission Electron Microscopy for Nanostructure Characterization

Quantitative characterization of electron detectors for transmission electron microscopy.

A new generation of direct electron detectors for transmission electron microscopy (TEM) promises significant improvement over previous detectors in terms of their modulation transfer function (MTF) and detective quantum efficiency (DQE). However, the performance of these new detectors needs to be carefully monitored in order to optimize imaging conditions and check for degradation over time. W...