A modern semiconductor diode is made of a crystal of semiconductor like silicon that has impurities added to it to create a region on one side that contains negative charge carriers, called n-type semiconductor, and a region on the other side that contains positive charge carriers, called p-type semiconductor. The diode's terminals are attached to each of these regions. The boundary within the crystal between these two regions, called a PN junction, is where the action of the diode takes place. Another type of semiconductor diode, the Schottky diode, is formed from the contact between a metal and a semiconductor rather than by a p-n junction. Diodes can be applied to radio demodulation, power conversion, over-voltage protection, logic gates, Ionizing radiation detectors, temperature measurements, and current steering.
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