Cadmium telluride
At the present time, the price of the raw materials cadmium and tellurium are a negligible proportion of the cost of CdTe solar cells and other CdTe devices. However, tellurium is an extremely rare element (1-5 parts per billion in the Earth's crust; see Abundances of the elements (data page)), and if CdTe were to be used in sufficiently large quantities (for example, to make enough solar cells to provide a significant proportion of worldwide energy consumption), tellurium availability could be a serious problem.
more read : Cadmium telluride
Selenium of high purity high purity tellurium; tellurium dioxide; crude selenium; crude tellurium; refined bismuth; selenious acid; of ITO; anhydrous indium oxide; gallium oxide; high purity manganese carbonate; high-purity iron oxide; indium oxide ; sodium selenite; long-term supply of gallium oxide v supply tellurium ingot, tellurium powder. Tellurium symbol: Te; color: Silver; Density: 6.24 Melting Point: 449.51; Boiling Point: 988, tellurium is one of the scattered metal, there are two allotropes, a crystalline form, with silver-white metallic luster; a amorphous black powder. Brittle. The chemical nature of selenium in tellurium, tellurium dioxide in the air or oxygen in the combustion, blue flame; easy and halogen violent reaction generates tellurium halides under high temperature and hydrogen role.
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Cadmium telluride can be alloyed with mercury to make a versatile infrared detector material (HgCdTe). Cadmium telluride alloyed with a small amount of zinc makes an excellent solid-state X-ray and gamma ray detector (CdZnTe).
Cadmium telluride is used as an infrared optical material for optical windows and lenses but it has small application and is limited by its toxicity such that few optical houses will consider working with it. An early form of Cadmium telluridefor IR use was marketed under the trademarked name of Irtran-6 but this is obsolete.
Cadmium telluride is also applied for electro-optic modulators. It has the greatest electro-optic coefficient of the linear electro-optic effect among II-VI compound crystals (r41 = r52 = r63 = 6.8 × 10-12 m / V).
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