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Schottky diode, hot carrier diode
The Schottky diode also known as hot carrier diode is a semiconductor diode with a low forward voltage drop and a very fast switching action. The cat's-whishker dectector used in the early days of wireless and metal rectifirers used in early power applications can be considered primitive Schottky diodes.
When current flows through a diode there is a small voltage drop across the diode terminals. A normal silicon diode has a voltage drop between 0.6–0.7 volts, while a Schottky diode voltage drop is between approximately 0.15–0.45 volts. This lower voltage drop can provide higher switching speed and better system efficiency.