Chalcogenides: Metastability and Phase Change Phenomena by Alexander V. Kolobov
By Alexander V. Kolobov
A state of the art description of metastability saw in chalcogenide alloys is gifted with the accessory at the underlying physics. A comparability is made among sulphur(selenium)-based chalcogenide glasses, the place a number of photo-induced phenomena ensue solely in the amorphous section, and tellurides the place a reversible crystal-to-amorphous phase-change transformation is an immense impact. purposes of metastability in devices¿optical stories and nonvolatile digital phase-change random-access thoughts between others are mentioned, together with the newest tendencies. historical past fabric crucial for figuring out present learn within the box is additionally provided.
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Reprinted with permission by Japan Society of Applied Physics from Endo et al. 4 920 940 960 980 1000 Temperature, T/K Fig. 7 shows spectral dependencies of absorption coefficients for typical amorphous semiconductors . 1) This relationship is often called the Tauc law. The coefficient B is of the order of 105 cm−1 eV−1 . This kind of spectral behaviour is fairly easy to understand assuming parabolic dependencies for the density of valence and conduction band states. 2 Optical Absorption 41 Fig.