Photodiodes have similar structure as a regular diode, where a p-n, p-i-n, or similar doping profile is used in the device. The structures of these devices are similar to their electrical analog in terms of doping. Phototransistors and photodiodes are analogs of regular transistors and diodes. This occurs through the same phenomenon that occurs in photovoltaic cells: incoming photons excite charge carriers into a higher energy level, and the charge carriers can be extracted into a load component/circuit. Photodiode OperationĪll phototransistors and photodiodes perform the same function: they receive incoming light and convert it to electricity. Here’s what you need to know about choosing a photodiode or phototransistor as a detector for your next optical product. photodiode depends on the particular application, but they are interchangeable in some ways. If you need to gather intensity measurements, a phototransistor or photodiode is an excellent choice for an optical detector.
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February 2023
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