Chalcogenides, glassy

Vassilev VS, Boycheva SV (2005) Chemical sensors with chalcogenide glassy membranes. Talanta 67 20-27... 

Conventional TSC in glassy selenium exhibits monotonic temperature dependence without the distinct structure that is characteristic of crystalline analog. The characteristic peaks attributed to traps are usually absent on TSC versus temperature dependencies. Such a behavior is typical for chalcogenide glassy semiconductors. 

If structural methods subsequently confirm that glassy CdGeAs2 does indeed have a tetrahedrally coordinated framework and AsXI a chain structure, it will show that an analysis of the Tg = Tg/n values provides a simple method for a rapid estimate of the structure of newly synthesized chalcogenide glassy semiconducting compounds (and other compounds with a similar chemical interaction) from a direct measurement of Tg, which can be carried out in the course of an hour (by differential thermal analysis). Qf course, this cannot be a substitute for a thorough structural investigation. 

Lyubin V. M and Klebanov M. L., Photo-Induced Metastability in Amorphous Semiconductors (Kolobov A. V., ed.). Chapter 6 "Photo-Induced Anisotropy in Chalcogenide Glassy Semiconductors, Wiley-VCH, Weinheim, pp. 91-108 (2003). 

Lyubin V., Chalcogenide glassy photoresists History of development, properties, and applications, Phys. Status Solidi B, 246, 1758-1767 (2009). 

The group of ion-selective electrodes with fixed ion-exchange sites includes systems with various membrane structures. The membranes are either homogeneous (single crystals, pressed pellets, sintered materials) or heterogeneous, set in an inactive skeleton of various polymeric materials. Important electrode materials include silver halides, silver and divalent metal chalcogenides, lanthanum trifluoride and various glassy materials. Here, the latter will be surveyed only briefly, for the sake of completeness. 

The Si chemical shifts of glassy and crystalline chalcogenide compounds are collected in Table 4.5. 

There are several materials which exhibit semiconducting behaviour in glassy state and are technologically important for their proven and potential device applications. The most notable of them are the amorphous silicon and a number of chalcogenide and pnictide glasses. In this chapter, we put together briefly the understanding we have of electron transport in such amorphous semiconductors. 

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