Photosensitive diode principle circuit

Published:2011/7/3 21:49:00 Author:Christina | Keyword: Photosensitive diode, principle circuit | From:SeekIC

The photosensitive diode is the same as the ordinary photosensitive diode, the PN junction of it has the one-way conductivity, so we need to add the inverse voltage when the photosensitive diode is working, as the figure shows. When there is no illumination, the circuit also has the small reverse saturated leakage current, this is equivalent of the conduction of the photosensitive diode; when there is the illumination, the PN junction is bombarded by the photons, the valence electrons which are bounded absorb the photon energy to produce the electron. The number of these current carriers has little effect for the most of carriers. Figure:Photosensitive diode principle circuit



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