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Copper indium gallium selenide CIGS unit cell. Red = Cu, yellow = Se, blue = In/Ga Identifiers CAS Number 12018-95-0 (CuInSe 2 ) Properties Chemical formula CuIn (1-x) Ga x Se 2 Density ~5.7 g/cm 3 Melting point 1,070 to 990 °C (1,960 to 1,810 °F; 1,340 to 1,260 K) (x=0–1) [1] Band gap 1.0–1.7 eV (x=0–1) [1] Structure Crystal structure tetragonal, Pearson symbol tI16 [1] Space group I 4 2d Lattice constant a  = 0.56–0.58 nm (x=0–1), c  = 1.10–1.15 nm (x=0–1) Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references Copper indium gallium (di)selenide ( CIGS ) is a I-III-VI 2 semiconductor material composed of copper, indium, gallium, and selenium. The material is a solid solution of copper indium selenide (often abbreviated "CIS") and copper gallium selenide . It has a chemical formula of CuIn (1-x) Ga (x) Se 2 w...

For solar tracking in plants, see Heliotropism. For solar telescope tracking, see Solar telescope. Largest single axis tracker project in Asia- 172MW- Arctech Solar 8-megawatt PV plant using horizontal single axis tracker, Greece [1] A solar tracker is a device that orients a payload toward the Sun. Payloads are usually solar panels, parabolic troughs, fresnel reflectors, lenses or the mirrors of a heliostat. For flat-panel photovoltaic systems, trackers are used to minimize the angle of incidence between the incoming sunlight and a photovoltaic panel. This increases the amount of energy produced from a fixed amount of installed power generating capacity. In standard photovoltaic applications, it was predicted in 2008-2009 that trackers could be used in at least 85% of commercial installations greater than one megawatt from 2009 to 2012. [2] [3] As the pricing, reliability and performance of single-axis trackers have improved, the systems have been installed in an incr...