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Doping
Doping
Schematic diagram of a photovoltaic system: silicon layers of a solar cell.

In the manufacture of Solar Cells, the semiconductor material (i.e. silicon) is doped, or contaminated, with an impurity, which means that chemical elements are added (diffused) with which either a positive charge surplus (p-type semiconductor), or a negative charge surplus (n-type semiconductor) is achieved. The electric current (Solar Current when produced by Photovoltaics) is created at the interface between the p-type semiconductor and the n-type semiconductor. Without the added impurities, or doping, no electric current could be created; instead, the semiconductor material would act as an insulator.

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