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However for a photovoltaic cell a high amount of conduction is required. To obtain this a semiconductor can be doped. This means that small amounts of impurities are added to the material, usually by diffusion, which yield extra charge carriers and so, raise the conductivity. These impurities are usually elements with a different number of electrons in the outer atomic shell which when put in the semiconductor will destroy the balance of eight electrons in each atoms outer shell...

These impurities are usually elements with a different number of electrons in the outer atomic shell which when put in the semiconductor will destroy the balance of eight electrons in each atoms outer shell. Either an additional electron will be present or a shortage of one. If there is an additional electron this is called an n-type semiconductor, where n stands for negative since the extra charge carrier is a negatively charged electron...

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