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Photoconductive Cells Manufacturers Suppliers-
Main components of photoconductive cells
The most commonly used photoconductive semiconductor materials are cadmium sulphide (CdS), cadmium selenide (CdSe). Fig. 2 shows the details of photoconductive cell. Fig. 2: Photoconductive Cell Construction The electrodes are made up of gold. These electrodes are placed on the photoconductive material. This assembly is encapsulated as shown in Fig. 3. When the photoconductive cell is kept in darkness, its resistance is. A simple application of photoconductive cell for relay control is shown in Fig. 4. When light on the photoconductive cell exceeds a particular value, current through the circuit increases and. The major drawback of photoconductive cell is that, temperature variations cause variation in resistance and in that case the resistance is not only.
FAQs about Main components of photoconductive cells
What are the essential elements of a photoconductive cell?
The essential elements of a photoconductive cell are the ceramic substrate, a layer of photoconductive material, metallic electrodes to connect the device into a circuit and a moisture resistant enclosure. The circuit symbol and construction of a typical photoconductive cell are shown.
What materials are used in photoconductive cells?
The most commonly used photoconductive semiconductor materials are cadmium sulphide (CdS), cadmium selenide (CdSe). Fig. 2 shows the details of photoconductive cell. Fig. 2: Photoconductive Cell Construction The electrodes are made up of gold. These electrodes are placed on the photoconductive material.
What is a photoconductive cell?
These devices consist of a thin single-crystal or polycrystalline film of compound semiconductor substances. The most commercially available are photoconductive cells, which are manufactured from cadmium sulfide (CdS), which is sensitive to light in the visible spectrum.
What is photoconductive cell construction & working?
Thus, free electrons and holes (charge carriers) are created within the material, and consequently its resistance is reduced. This is known as the Photoconductive effect. The Photoconductive Cell Construction and Working is illustrated in Fig. 20-10 (a), and the graphic symbol is shown in Fig. 20-10 (b).
What are the disadvantages of a photoconductive cell?
The major drawback of photoconductive cell is that, temperature variations cause variation in resistance and in that case the resistance is not only dependent on amount of light only. If constant voltage is applied to such conductor, the current varies as the amount of light falling on it varies (because resistance varies).
What is a photoconductive material?
Commonly used photoconductive materials include cadmium sulfide (CdS), amorphous silicon (a-Si), and organic semiconductors. When light of an appropriate wavelength falls on the photoconductor, photons are absorbed by the material. This provides the energy needed to excite bound electrons, leaving behind positive holes.
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