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( Solar cell)
A solar cell or photovoltaic cell is a large area electronic[1] device that converts solar energy into electricity by the photovoltaic effect. Photovoltaics is the field of technology and research related to the application of solar cells for solar energy. Sometimes the term solar cell is reserved for devices intended specifically to capture energy from sunlight, while the term photovoltaic cell is used when the source is unspecified. Assemblies of cells are used to make solar modules, or photovoltaic arrays. Solar cells have many applications. Cells are used for powering small devices such as electronic calculators. Photovoltaic arrays generate a form of renewable electricity, particularly useful in situations where electrical power from the grid is unavailable such as in remote area power systems, Earth-orbiting satellites and space probes, remote radiotelephones and water pumping applications. Photovoltaic electricity is also increasingly deployed in grid-tied electrical systems. Similar devices intended to capture energy from other sources include thermophotovoltaic cells, betavoltaics cells, and optoelectric nuclear batteries. The term "photovoltaic" comes from the Greek f?? (phos) meaning "light", and "voltaic", meaning electric, from the name of the Italian physicist Volta, after whom a unit of electrical potential, the volt, is named. The term "photo-voltaic" has been in use in English since 1849.[2] The photovoltaic effect was first recognized in 1839 by French physicist A. E. Becquerel. However, it was not until 1883 that the first solar cell was built, by Charles Fritts, who coated the semiconductor selenium with an extremely thin layer of gold to form the junctions. The device was only around 1% efficient. Sven Ason Berglund had a number of patents concerning methods of increasing the capacity of these cells. Russell Ohl patented the modern junction semiconductor solar cell in 1946 (U.S. Patent 2,402,662&_160;, "Light sensitive device"), which was discovered while working on the series of advances that would lead to the transistor.
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