What's is photoconductive industry.?
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Answer:
Photoconductivity is an optical and electrical phenomenon, which material's electrical conductivity increase by absorption of electromagnetic radiation (e.g. visible light, ultraviolet light, infrared light). Photoconductive polymers can serve as good insulators when the electricity, free electrons and holes are absent.
In general, the polymers usually satisfy these two features.
1. Photoconductive polymers can absorb light to excite electrons from ground state to excited state. The photoexcited electron will form a pair of charge carriers, it can be separated by electric field.
2. Photoconductive polymers must allow migration of either photoexcited electrons or holes, or both, through the polymer in the electric field towards the appropriate electrodes.
Photoconductive polymers act merely as charge-transporting media, and it can be p-type or n-type, however most known photoconductive polymers are p-type (only transport holes). Photocurrents usually observed are very small in organic compounds. The mobilities μ are typically 10−12-10−18 m2V−1s−1. And photocurrents are usually effected by charge-carrier generation, injection and transport.
Photoconductive polymers have been developed into different types, there are two mainly types, one is negative photoconductivity, another one is magnetic photoconductivity. The photoconductive polymers have been greatly enriched the photoconductive material, and there are many applications (e.g. xerography, laser printers)