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Phototransistors
Semiconductor elements have played a huge role in shaping modern electronic systems. First bipolar transistor was invented in the first half of the 20th century. The bipolar transistor is made of three semiconductor layers with different types of conductivity (p-n-p or n-p-n), which results in two types of bipolar transistors - PNP and NPN. The individual layers have their names: E - emitter, B - base, C - collector. The basis of the use of the transistor is the dependence of the value of the greater current flowing between the emitter-collector junction, on the changes in the value of the lower current flowing in the base-emitter junction.
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Phototransistors - FAQ
A phototransistor is an optoelectronic element - the current value at the emitter-collector junction is controlled by the intensity of light that falls on the junction. These types of elements are used, for example, as optoisolators, thanks to which the signal is transmitted via light.
A phototransistor is a transistor that responds to changes in light intensity, which results in changes in current at the emitter-collector junction. In an ordinary transistor, such changes are influenced by the current at the base-emitter junction. In a phototransistor, photons that land on the base-emitter junction polarize it in the forward direction, thus allowing current to flow through the emitter-collector junction.
Optoelectronics are electronic components that use light - for example, they actively respond to light or can emit it themselves. Optoelectronic elements include, for example, displays and LEDs, photoresistors , phototransistors and photodiodes.