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Technology Stocks : Veeco Instruments-Who?

VECO 28.75

-1.4%

Oct 31 9:30 AM EDT

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To: FJB who wrote (2989)	4/9/2008 8:22:25 AM
From: FJB	of 3069

Copper indium gallium selenide (CIGS) is a new semiconductor material comprising copper, indium, gallium, and selenium. The chemical formula is CuInxGa(1-x)Se2, where the value of x can vary from 1 (pure copper indium selenide) to 0 (pure copper gallium selenide). It is a tetrahedrally-bonded semiconductor, with the chalcopyrite crystal structure, and a bandgap varying continuously with x from about 1.0eV (for copper indium selenide) to about 1.7eV (for copper gallium selenide) Its main use is for photovoltaic cells (CIGS cells), in the form of polycrystalline thin films. Unlike the silicon cells based on p-n junction, the structure of CIGS is a complex heterojunction system. The best efficiency achieved as of December 2005 was 19.5% reported by Contreras et al [1], which is by far the highest compared with those achieved by other thin film technologies such as Cadmium Telluride (CdTe) or amorphous silicon (a-Si). [2] en.wikipedia.org

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