Solar cells
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It is no wonder that one marvels on how such a device would function. To understand how a solar cell works, it is necessary to go back to some basic atomic conceptsIn the simplest model of the atom, electrons orbit a central nucleus, composed of protons and neutronseach electron carries one negative charge and each proton one positive chargeNeutrons carry no chargeEvery atom has the same number of electrons as there are protons, so, on the whole, it is electrically neutralThe electrons have discrete kinetic energy levels, which increase with the orbital radius. When atoms bond together to form a solid, the electron energy levels merge into bands
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