Transmission Electron Microscopy of Semiconductor Nanostructures: Analysis of Composition and Strain State pp 1-9 | Cite as
Introduction
Abstract
The techniques described in this book are aimed at investigation of the properties of crystal with a spatial resolution that provides the view into the unit cell of the crystal. For this purpose, high-energy electrons are preferable, among all the different kinds of radiation that could be used. First, electrons possess a charge, and a beam of electrons can be focused in an inhomogeneous magnetic field, which allows the construction of an electromagnetic focusing lens. Among charged particles, electrons (and also positrons, but these are not useful here) possess the smallest mass, which minimizes the structural damage that they cause in the specimen. In the transmission electron microscope (TEM), electrons are accelerated to a few hundreds of keV. The de Broglie wavelength of the electrons is of the order of only a few picometers, and the point resolution of modern TEMs lies in the 0.1 nm range. In addition to the good spatial resolution, the strong interaction of the electrons with matter allows the interaction volume to be extremely small. One single column of only a few atoms is sufficient to determine the positions and, in principle, also the types of the atoms from the scattered electron wave.
Keywords
Specimen Thickness Tetragonal Distortion Atomic Column Composition Evaluation Elastic RelaxationPreview
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