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Photodiodes and Phototransistors Overview by numbr is a document available to read on EtoBox.

Photodiodes and phototransistors are optical sensors. Photodiodes are constructed like diodes but without opaque coatings, allowing light to affect conductivity. Incident light generates a current even under reverse bias. Phototransistors combine a photodiode and transistor, where light illuminates the base, modulating the collector current with a gain of 100-1000. Both devices convert light to current but phototransistors have gain while photodiodes have better linearity and bandwidth.

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