Semiconductor chalcogenides

The cadmium chalcogenide semiconductors (qv) have found numerous appHcations ranging from rectifiers to photoconductive detectors in smoke alarms. Many Cd compounds, eg, sulfide, tungstate, selenide, teUuride, and oxide, are used as phosphors in luminescent screens and scintiUation counters. Glass colored with cadmium sulfoselenides is used as a color filter in spectroscopy and has recently attracted attention as a third-order, nonlinear optical switching material (see Nonlinear optical materials). DiaLkylcadmium compounds are polymerization catalysts for production of poly(vinyl chloride) (PVC), poly(vinyl acetate) (PVA), and poly(methyl methacrylate) (PMMA). Mixed with TiCl, they catalyze the polymerization of ethylene and propylene. 

Froment M, Lincot D (1995) Phase formation processes in solution at the atomic level Metal chalcogenide semiconductors. Electrochim Acta 40 1293-1303... 

Somasundaram S, Chenthamarakshan CR, Tacconi NR, Ming Y, Rajeshwar K (2004) Photoassisted deposition of chalcogenide semiconductors on the titanium dioxide surface Mechanistic and other aspects. Chem Mater 16 3846-3852... 

The arrangement of zinc and sulfur atoms in the Zn4S core is similar to the observed Zn40. Theoretical calculations demonstrated that the compound is a poor model of extended metal chalcogenide semiconductors (ZnS). Octanuclear zinc compounds have also been structurally characterized with this core. In the presence of an alkylammonium cation, a sulfide containing octanuclear zinc species was formed [BzEt3N]2[Zng(S)(SBz)i6].126 The complexes with benzylthiolate... 

The chemistry of the chalcogenolate compounds of these elements is dominated for the seek of molecular precursors for the deposition of 13/16 chalcogenide semiconductors by MOCVD or related techniques.159... 

Solution Processing of Chalcogenide Semiconductors via Dimensional Reduction... 

Mitzi, D. B. Copel, M. Chey, S. J. 2005. Low-voltage transistor employing a high-mobility spin-coated chalcogenide semiconductor. Adv. Mater. 17 1285-1289. 

Recently, we and others demonstrated that appropriate germanide Zintl clusters in non-aqueous liquid-crystalline phases of cationic surfactants can assemble well-ordered mesostructured and mesoporous germanium-based semiconductors. These include mesostructured cubic gyroidal and hexagonal mesoporous Ge as well as ordered mesoporous binary intermetallic alloys and Ge-rich chalcogenide semiconductors. 

The basic recipe for producing Q-state metal chalcogenide semiconductors involves the exposure of metal ions to a source of the chalcogenide in the presence of some stabilizing medium (7 and ref. therein). This is depicted in Eq. (1) for the specific case of divalent metal ions reacting with the sulfide ion ... 

General aspects of the TSDC theory are discussed in an excellent review [2], The main emphasis in this text is on experimental use of the TSDC method for amorphous chalcogenide semiconductors and on corresponding results for these intriguing objects. 

This section contains a review of results on the extensive study of defect states in the mobility gap of amorphous As- and Sb-containing chalcogenide semiconductors by relaxation technique. For extracting typical features, elemental selenium and simple compositions with relatively low content of arsenic and antimony are exemplified as possible. We will try to attribute TSDC peaks to charge carriers released from the respective trapping levels in the band gap of these materials. 

Time-of-Flight Experiments in Amorphous Chalcogenide Semiconductors... 

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