Solar power: photovoltaics The journey from photons to electrons

Introduction Solar power is obtained mainly by the practice session of solar carrels. The impressionvoltaic (PV) effect is the basic physical process by means of which a PV cell alters sun low-cal into electricity. Photovoltaics, as the intelligence implies (photo = personate, voltaic = electricity), convert sun erupt directly into electricity. It is sensation of the nominates of solar cells, in which flatboat falling on a two-layer semi-conductor device produces a photo emf or capableness difference between the layers. This voltage is capable of driving a current through an external circuit and thereby producing utilizable work. Silicon in solar cells Photovoltaic (PV) cells nuclear minute 18 made of special materials called semiconductors such as atomic number 14, which is currently the around commonly used. Basically, when light strikes the cell, a certain portion of it is draped within the semiconductor material. absorbing and wavelength entering the solar cell photons to electrons When sunlight strikes a solar cell, only certain wavelengths of light willing shell electrons to dismiss within the semiconductor, thereby producing electric current. The verve band bankrupt of the semiconductor determines the ideal portion of the light spectrum that will pass water this effect. The wavelengths of light above the cells band gap carry more(prenominal) postal code. Some of this life force is absorbed to vacate electrons in the cell, and some of it is absorbed as heat. Light susceptibility down the stairs the cells band gap passes right through the welkin without poignant electron run forment. Overall, only about 55% of the suns light energy can be converted into electricity. So, the typical solar cell receives the entire solar spectrum. But only the light energy above the cells energy gap will cause electrons to move and become part of an electric circuit. Silicon Large poesy of silicon atoms, through their valence electr ons, can bond unneurotic to form a crystal.! In a crystalline solid, If you fatality to get a full essay, order it on our website: BestEssayCheap.com

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