The structure of the diode

Diode is the abbreviation of crystal diode, also called semiconductor diode. It is made of semiconductor single crystal materials (mainly germanium and silicon). It is the most basic device among semiconductor devices. It is a passive semiconductor with unidirectional conductivity. Device.

       The crystal diode is composed of a PN junction and two lead electrodes, as shown in Figure (a). The lead from the P-type area is the anode of the diode, and the lead from the N-type area is the cathode of the diode. Figure (b) is the representative symbol of the diode in the circuit diagram. The PN junction of the diode is mainly called germanium diode composed of germanium material, and called silicon diode composed of silicon material.

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