These are the emitter, base, & collector regions and the junctions are along the emitter-base & base-collector interfaces. Like normal transistors, a phototransistor has three regions or layers and two junctions. This device is ideal for photodetection, electronic switching, and current amplification applications. For a phototransistor, the photocurrent generated in the base region due to the incident light acts as the base current and regulates the collector to emitter current. The collector-to-emitter current flow in a normal transistor depends on the base current present in it. A photodiode is a semiconductor device that converts the incident light into an electric current known as photocurrent while a transistor is a device that regulates & amplifies the voltage or the current flow through it.
A phototransistor is a bipolar junction transistor (BJT) that combines the concepts of both photodiodes and transistors into a single device.
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