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Zinc selenide is the inorganic compound with the formula ZnSe. It is a lemon-yellow solid although most samples have a duller color due to the effects of oxidation. It is an intrinsic semiconductor with a band gap of about 2.70 eV at 25 °C (77 °F), equivalent to a wavelength of 459 nm.
The selenide dianion Se 2− forms a variety of compounds, including the minerals from which selenium is obtained commercially. Illustrative selenides include mercury selenide (HgSe), lead selenide (PbSe), zinc selenide (ZnSe), and copper indium gallium diselenide (Cu(Ga,In)Se 2). These materials are semiconductors.
South Africa is the southernmost country in Africa. It is the 25th-largest country in the world by land area, and with close to 60 million people, is the world's 24th-most populous nation. The World Bank classifies South Africa as an upper-middle-income economy, and a newly industrialised country. [1] [2] Its economy is the largest in Africa ...
A compound semiconductor is a semiconductor compound composed of chemical elements of at least two different species. These semiconductors form for example in periodic table groups 13–15 (old groups III–V), for example of elements from the Boron group (old group III, boron, aluminium, gallium, indium) and from group 15 (old group V, nitrogen, phosphorus, arsenic, antimony, bismuth).
The company was founded in 1975 by a consortium that included Anthony Simon Malone, and acquired Rand London Mines. In the following years Metorex acquired additional properties mining a variety of minerals including gold, coal, asbestos, copper, zinc and tin. The mines were located in South Africa, Namibia and Zambia.
List of notable companies manufacturing copper indium gallium selenide solar cells (CIGS): Ascent Solar Technologies; Avancis (former subsidiary of Saint Gobain) Miasolé [1] Midsummer AB [2] (Swedish manufacturer of CIGS solar modules and sputtering equipment for thin-film solar cells) Sunflare [3] Sunplugged [4] Solar Cloth [5]
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Compared to the more common zinc selenide-based optics, materials such as thallium bromoiodide enable transmission at longer wavelengths. In the infrared , this allows for measurements as low as 350 cm −1 (28 μm), whereas zinc selenide is opaque by 21.5 μm, and ZnSe optics are generally only usable to 650 cm −1 (15 μm).