Infrared remote control equipment needs to have narrow band spectral response so that its operation will not affected by visible light. Photodetectors are semiconductor devices that can detect optical signals through electronic processes. The operation of a general photodetector includes basically three processes: carrier generation by incident light, carrier transport, and extraction of carriers as terminal current to provide the output signal.

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Omar Badr Mohammed works at college of electronics engineering in Mosul university as a faculty member. He received the B.Sc. and the M.Sc. degrees in electrical engineering from electrical engineering department/Mosul University. his specialist is in solid state electronics and devices.