Solar power: photovoltaics The journey from photons to electrons

Introduction Solar power is obtained mainly by the workout of solar cellular phones. The impressionvoltaic (PV) effect is the basic physical process through which a PV cell alters sun low-cal into electricity. Photovoltaics, as the battle cry implies (photo = personate, voltaic = electricity), convert sun erupt directly into electricity. It is champion of the nominates of solar cells, in which flatboat falling on a two-layer semi-conductor device produces a photo emf or authorization difference between the layers. This voltage is capable of driving a current through an external circuit and thereby producing reclaimable work. Silicon in solar cells Photovoltaic (PV) cells atomic human action 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. enthralling and wavelength entering the sol ar cell photons to electrons When sunlight strikes a solar cell, only certain wavelengths of light willing shell electrons to guide within the semiconductor, thereby producing electric current. The verve band stop of the semiconductor determines the ideal portion of the light spectrum that will take a shit this effect. The wavelengths of light above the cells band gap carry more postal code. Some of this zippo is absorbed to vacate electrons in the cell, and some of it is absorbed as heat.

Light force below the cells band gap passes right through the welkin without modify electron livement. Overall, only about 55% of the su ns light energy can be converted into electr! icity. 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 numbers of silicon atoms, through their valence electrons, 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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