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Material consideration. Absorption of light and extraction of photocharges
Once a photon enters into a solar cell (made up of a p-n junction) it can generate a pair of electron-hole carriers. This pair will be then spatially separated by the internal electric field of the junction. Therefore to reach a contact (on a side of the solar cell) a carrier will need to travel all the depletion region length and also to diffuse then through all the neutral region length....
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