Introduction to diode

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Introduction to diode

The crystal diode is a p-n junction formed of a p-type semiconductor and an n-type semiconductor, and a space charge layer is formed on both sides of the interface, and a self-built electric field is built. When there is no applied voltage, the diffusion current caused by the difference in carrier concentration on both sides of the p-n junction is equal to the drift current caused by the self-built electric field, and is in an electric equilibrium state. When the outside is biased by the forward voltage, the mutual suppression of the external electric field and the self-built electric field causes the diffusion current of the carrier to increase to cause a forward current. When the outside has a reverse voltage bias, the external electric field and the self-built electric field are further strengthened to form a reverse saturation current I0 that is independent of the reverse bias voltage value within a certain reverse voltage range.

The English of the diode is diode. The positive and negative terminals of the diode, (as shown) one end is called the anode, and the other end is called the cathode. The current can only move from the anode to the cathode. A diode is a device composed of a semiconductor. The semiconductor can flow current in either direction.