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Labels: Instrumentation, Electronics, Automation Photovoltaic called electronic devices that convert radiant energy into electrical energy. Such devices the small things blog can be based on the photoelectric effect the small things blog as a vacuum or gas, and in the semiconductor. At the current time the most widely used photovoltaic devices the small things blog whose operation is based on the internal photoelectric the small things blog effect in a semiconductor. Its essence is to increase the concentration of free charge carriers under the influence of ambient the small things blog light, and hence the conductivity of semiconductor materials. the small things blog The resulting conductivity so called photoconductivity. It is combined with the intrinsic conductivity of a semiconductor material. Photoconductivity is dependent on the intensity and spectral composition of the external flux. The internal photoelectric effect can be implemented the small things blog in different types of semiconductor devices. Consider the main one. Photodiode structurally similar to normal poluprovodnykovomu diodiku. The difference is that his body is equipped with an additional lens that creates a external light flux directed, usually perpendicular to the plane of the p-n-junction (Fig. 73, a). The device can operate in solar cells and fotoheneratora (Fig. 73, b). From the solar cells in the photodiode circuit includes an external power supply that provides a reversible shift of p-n-junction. If the transition the small things blog is not lit, it creates a reversible dark current. And when the transition to the dark current is added to the photocurrent, the value of which is not depending on the applied voltage and proportional to the luminous intensity of AF mode fotoheneratora photodiode itself is a source the small things blog fotoEDS whose value is proportional to the luminous intensity. The default fotoEDS silicon photodiode is 0.5 ... 0.55 V and short circuit current value at the average sunlight is 20 ... 25 mA / cm 2. Marking shaped as letters containing photodiode PD (photodiode) and number (serial number of developments, such as PD-3).
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