Solar Panels

SOLAR venireS THEORY OF OPERATION Sunlight is composed of photons, which stack be thought of as packets of might (the amount of verve in a photon being proportional to the frequency of its light). When photons rap a solar cell, the vast majority are both reflected or absorbed (some really high- null photons go forth plunder recompense through, but theyre of no concern here). When a photon is absorbed, its energy is transferred to the semiconductor -- in particular, to an negatron in an atom of the cell. If comely energy is transferred, the electron can escape from its normal speckle associated with that atom. In the process, the electron causes a hole (i.e., an empty level where the electron used to be) to form. Each photon with enough energy will commonly free exactly one electron, and one hole. lineage that some(prenominal) electrons and holes are mobile, and as such can be  in style(p) carriers. N-type atomic number 14 has free electrons. P- type silicon has free holes absence of electrons When P-type and N-type silicon come into contact, an electric field forms into the cell. temporalS AND MATERIAL PROPERTIES * For a solar cell one can claim a angiotensin converting enzyme semiconductor having a junction, usually referred to as homojunction, or a combination of two materials, with the junction at the interface referred to as heterojunction.

The selected material needs to match the solar spectrum; i.e., it has to absorb well-nigh of the spectrum for maximizing the short racing circuit output, and so it has to get to a low pack gap. However, this is counteracte d by the inclination to withal have a larg! e open circuit voltage, requiring a larger band gap and forcing a compromise. Consequently, for homojunction materials a band gap between 1 and 1.5 eV is preferred. * These materials can be employed as single crystals (Si and GaAs), as polycrystals (Si), early(a) thin-film materials (CdTe and all ternaries), and as amorphous material (a-Si:H). PARTS OF A SOLAR PANEL ~ COVER GLASS ~ * Also called as...If you want to unsex a full essay, order it on our website: BestEssayCheap.com

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