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Transmission Electron Microscopy of Semiconductor Nanostructures: An Analysis of Composition and Strain State (Springer Tracts in Modern Physics)
°ëµ¼ÌåÄÉÃ׽ṹµÄ͸Éäµç¾µ·ÖÎö£º³É·Ö¼°Ó¦±ä·ÖÎö£¨Ó¢Îİ棩
Author(s):        Andreas Rosenauer
Year:        2003       
Edition:        1
Language:        English       
Pages:        238
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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.
The interaction of the electron beam with the specimen provides many
channels of information that can be used for compositional analysis. First,
the inelastic scattering of electrons can be used for energy-dispersive X-ray
analysis (EDX), electron energy loss spectroscopy (EELS) and energy-filtered
TEM (EFTEM) [1]. The spatial resolution, of the order of a few nanometers,
is generally not sufficient to measure the composition of nanostructures with
good accuracy. As an alternative, high-resolution TEM (HRTEM) can be
utilized in combination with appropriate image evaluation techniques, where
a resolution of the order of 0.2 nm can be achieved.
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