Photodiodes are receivers of optical radiation that convert the light flux that has fallen on their sensitive area into electrical signals through the processes occurring at the pn junction.
In photodiodes, electrons and holes in the n- and p-regions are separated, due to which electric charges and EMF are formed. Such devices are called solar cells.
There are photodiodes with a pin junction - between the layers n and p is an undoped semiconductor i. Such photodiodes only convert light into current, while avalanche photodiodes and phototransistors amplify the output current.
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