As infrared phototransistors provide wideband absorption and quantum efficiency, they can be integrated into a compact image sensor (e.g., CMOS image sensor) over a broad range of wavelengths. These components need some supporting circuitry to be implemented in a larger system, but this allows the designer to tune the electrical output. Infrared phototransistors are largely the same as their visible-light-sensitive cousins, and they are often compared to infrared photodiodes. Common photosensitive elements for use as detectors include photodiodes and phototransistors. Infrared electro-optical systems need sources and detectors to operate properly, and each will need to be added to a circuit in certain ways to maximize power transfer into/out of a circuit. Infrared phototransistors and other infrared detector components can be used in imaging systems and as detectors in a number of other systems. These devices function like regular transistors, but the gate/base is activated by incoming photons.Ī variety of materials and device architectures can be used to build phototransistors, and these devices can be incorporated into several electro-optical systems. Phototransistors are one option for detecting light and converting it to an electric current.
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