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Question: a pn photodiode acts as a photocell the circuit is...

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PHOTOCELLS Operate in the photovoltaic mode Without an external power source Main usage for energy conversion Example amorphous-Si solar cells Efficiency: 10-15% R,=00 Load line Vdepends both Working point (in the photovoltaic mode) on the light power PR, 0 and on the loading resistor RL

A p-n photodiode acts as a photocell, the circuit is shown in the handouts. Outline the band profile of the diode for infinitely large RL for different levels of illumination (i.e. in darkness, low and very high illumination).

(15 marks)

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