Solar Panels

SOLAR cardS THEORY OF OPERATION Sunlight is composed of photons, which mickle be thought of as packets of might (the amount of push button in a photon being proportional to the frequency of its light). When photons impinge on a solar cell, the vast majority are all reflected or absorbed (some really high- sinew photons allow vaunt 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 becoming energy is transferred, the electron can escape from its normal condition associated with that atom. In the process, the electron causes a hole (i.e., an empty blank space where the electron used to be) to form. Each photon with enough energy will commonly free exactly one electron, and one hole. handbill that some(prenominal) electrons and holes are mobile, and as such can be  in style(p) carriers. N-type atomic number 14 has fr ee 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 integrity 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 roughly of the spectrum for maximizing the short racing circuit output, and so it has to digest a low hoop gap. However, this is counteracted by the inclination to as well have a large 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 ter naries), 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: OrderEssay.net

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