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Essay text:
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 concepts. In the simplest model of the
atom, electrons orbit a central nucleus, composed of protons and
neutrons. each electron carries one negative charge and each
proton one positive charge. Neutrons carry no charge. Every atom
has the same number of electrons as there are protons, so, on the
whole, it is electrically neutral. The 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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