A phototransistor is what?
A phototransistor is a photosensitive transistor that is used to boost the photocurrent produced by changing the energy of light.
It is either a two-terminal or a three-terminal device, depending on the design. It might be a BJT (Bipolar Junction Transistor) or a three-layer FET (Field Effect Transistor).
The emitter, collector, and base area are its three regions. When compared to a typical BJT, the collector region has a bigger area. Through a lens that concentrates the light, it penetrates the base region and creates electron-hole pairs, which create a photocurrent.
Similar to BJT transistors, it contains two PN junctions.
A photodiode: What Is It?
A photodiode is a photosensitive diode that converts light energy into electricity. It is constructed out of silicon or germanium. It is a single-PN junction device that employs the photoelectric effect as its governing theory.
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