In practical terms, there are two different types of metal-semiconductor contact: (1) recti-fying contacts that are widely known as Schottky diodes and (2) ohmic contacts.<br>Schottky diodes have current-voltage characteristics very similar to those of the P-N junctions, but there is also an important difference: Schottky diodes operate with a single type of carrier (the majority carriers). The irrelevance of the minority carriers means that the stored-charge effect does not exist, which makes the Schottky diodes suitable for fast switching applications.<br>Ohmic contacts have linear current-voltage characteristics, so they enable the semi-conductor devices to be contacted by metal conductors
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