P N type semiconductors

P N type semiconductors

P N type semiconductors                  02/13/16
Silicon has an octet structure chemical structure, which means that it’s outer shell has four valence electrons. When sunlight strikes silicon, one of the electrons are jettisoned from the outer shell and is free to move around randomly within the material. However, for practical purposes, humans want it to move in one direction. This is accomplishable with the use of P and N type semiconductors. There  are two types, N and P type semiconductors. With the latter, a paltry amount of elements with 5 outer electrons are added, forming a bond with silicon as well as leaving one electron free. This free electron can be knocked in in a perfunctory manner by sunlight. P type semiconductors are bonded with elements that are one electron short ( a hole), therefore allowing for easy acceptance of an extra electron. N-type semiconductors conduct electric current through the transfer of electrons, while P-type conducts current through the transfer of “holes”. P and N types can then be amalgamated to create a P-N junction. In P-N junctions, the two types are put right next to each other, first causing an electrical exchange (the P-type will receive electrons and become negative and vice versa for N-types). When sunlight strikes the material, the free electron will be repulsed by the negatively charged P-type and be attracted to the positive N-type. And that is how solar panels work

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