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charge injection device

astronomy
Also known as: CID

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comparison to charge-coupled device

  • Keck Observatory
    In telescope: Charge-coupled devices

    Another similar device, the charge injection device, is sometimes employed. The basic difference between the CID and the CCD is in the way the electric charge is transferred before it is recorded; however, the two devices may be used interchangeably as far as astronomical work is concerned.

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semiconductor device

minority carrier injection, in electronics, a process taking place at the boundary between p-type and n-type semiconductor materials, used in some types of transistors. Each semiconductor material contains two types of freely moving charges: electrons (negative charges) and holes (positive charges). Electrons are the more abundant, or majority, carrier in n-type materials, holes being the less abundant, or minority, carrier. In p-type materials, however, holes are the majority carrier, and electrons the minority carrier. If a battery is properly connected to the semiconductor material, the p-type material may acquire additional electrons (minority carriers), injected into the p-type material from the n-type material by the flow of electrons from the battery. This is minority carrier injection. It is important in bipolar junction transistors, which are made of two p-n junctions.

This article was most recently revised and updated by William L. Hosch.