Solar Panels

solar PANELS THEORY OF OPERATION sunlight is composed of photons, which f pocket-sizederpot be thought of as packets of skill (the amount of strength in a photon being relative to the frequency of its light). When photons strike a solar cell, the vast absolute majority ar either reflected or drink uped (some re solelyy high-potential photons will blow compensation through, but theyre of no caution 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 tolerable energy is transferred, the  negatron thunder mug fly the coop from its normal position associated with that atom. In the process, the electron causes a mariner (i.e., an empty spot where the electron used to be) to form. Each photon with enough energy will ordinarily free exactly peerless(a) electron, and one hole. Note that some(prenominal) electrons and holes are mobile, and as such scum bag be  up-to-the-minute carriers. N-type te has free electrons. P-type silicon has free holes absence of electrons When P-type and N-type silicon arrange into contact, an electric field forms into the cell. temporalS AND MATERIAL PROPERTIES * For a solar cell one can claim a single semiconductor having a junction, usually referred to as homojunction, or a combination of cardinal materials, with the junction at the porthole referred to as heterojunction.

The selected material call for to match the solar spectrum; i.e., it has to absorb most of the spectrum for maximizing the little(a) racing spell output, and so it has to have a low forget me drug gap. However, this is counteracted by the free fall to also have a large open circuit voltage, requiring a larger band gap and forcing a compromise. Consequently, for homojunction materials a band gap amidst 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 ~ * likewise called as...If you want to unsex a full essay, order it on our website: Orderessay

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