What is the PN junction of a transistor, and what is the connection between the diode and the PN jun

When p-type semiconductors and n-type semiconductors come into contact with each other, the area where they junction is called the p-n junction. The free holes in the p-region and the free electrons in the n-region are diffused to each other's regions, resulting in the accumulation of positive and negative charges on both sides of the p-n junction and the formation of an electric dipole layer (Figure 4). The direction of the electric field in the electric dipole layer prevents diffusion from proceeding.

When the diffusion caused by the unequal carrier number density and the action of the electric field in the galvanic layer reach equilibrium, a certain potential difference is formed between the p and n regions, which is called the contact potential difference. Because the holes in the p-region diffuse to the n-region and recombine with the electrons in the n-region, and the electrons in the n-region diffuse to the p-region and recombine with the holes in the p-region, which reduces the number of free carriers in the electric dipole layer and forms a high-resistance layer, the electric dipole layer is also called the barrier layer, and the resistance value of the barrier layer is often dozens or even hundreds of times the original resistance value of the semiconductor that makes up the pn junction.

The PN junction has unidirectional conductivity, and the semiconductor rectifier is made by taking advantage of this characteristic of the PN junction. Another important property of PN junction is that it can generate electromotive force after being exposed to light, which is called the photogenerated voltaic effect, which can be used to make photocells. Semiconductor devices such as semiconductor triodes, thyristors, PN junction photosensitive devices, and light-emitting diodes all take advantage of the characteristics of PN junctions.

What is a PN knot? That is, when p-shaped semiconductors and n-shaped semiconductors are made together, p-shaped semiconductors are electropositive, while n-shaped semiconductors are electronegative. The holes in the p-shaped semiconductor will diffuse to the n-shaped semiconductor, and the electrons in the n-shaped semiconductor will diffuse to the p-shaped semiconductor, thus forming a space charge region.

A diode is an electronic device that consists of two differently doped semiconductor materials, usually a p-type semiconductor and an n-type semiconductor, that form a p-n junction at the point of contact. The p-n junction is a region formed by the interface between a p-type semiconductor and an n-type semiconductor, in which a doped material (usually boron) in a p-type semiconductor is combined with a doped material (usually phosphorus or nitrogen) in an n-type semiconductor. When the p-n junction is at a forward bias voltage, current can flow through the diode because electrons flow from n-type semiconductors to p-type semiconductors and holes flow from p-type semiconductors to n-type semiconductors.

When the p-n junction is at a reverse bias voltage, the charge carriers are blocked and current cannot flow through the diode. This characteristic allows diodes to be used as basic components in circuits such as rectifiers, switches, voltage regulators, etc. Therefore, the PN junction is the core component of the diode, and its formation and doping determine the electrical characteristics of the diode.

A diode is an electronic component that consists of a p-type semiconductor and an n-type semiconductor through a p-n junction. The p-n junction is an important part of the diode, and it is the interface that connects the p-type semiconductor and the n-type semiconductor together. When there is a positive voltage acting on the p-region at the p-n junction, the holes in the p-region will diffuse to the p-n junction, and the free electrons in the n-region will also diffuse to the p-n junction, and an electric barrier will be formed on both sides of the p-n junction to prevent further diffusion of current.

When there is a reverse voltage acting on the p-region at the p-node, the holes in the p-region and the free electrons in the clump cavity in the n-region will be compressed far away from the p-n junction, and the potential barrier of the p-n junction will increase, thus preventing the passage of current even more. As a result, diodes have very good unidirectional conductivity, allowing current to flow only from p-type semiconductors to n-type semiconductors, and not in the opposite direction. In short, the p-n junction is a structure that must be formed in the process of diode fabrication, which forms an electric barrier through the interface between p-type semiconductors and n-type semiconductors, so as to realize the unidirectional conduction function of the diode.

Diodes are important electronic devices widely used in various fields such as electronics, communications, and computers.

I have helped you find the results; The connection between the diode and the p-n junction is: the diode and the p-n junction is a related structure, which is composed of two heads, which can be connected by the path of the medium through the flow of electrons, and its conduction principle is conducive to the formation of n-type and p-type semiconductor structures. Its basic structure consists of N-type and P-type silicon rotten balance sheets encapsulated in the same metal head, which are connected to a conductive metal mouth (usually copper) and sealed with a colloidal material to resist moisture and oxidation.

A similar PN junction also includes other components, such as inverters, photodiodes, junction devices, light sources, transistors, etc. The functions of these components vary from p.n. to p., but they all have the same structure: they are composed of n-type semiconductors and p-type semiconductors, which allows them to be connected between circuits to realize the jump and control of the circuit, thus forming an electrically closed path to control the input and output of the circuit.

4.There is only one pn junction in the triode internal communication, and there is only one pn junction in the internal general study of the triode, hello dear, the triode has two pn sections, so it has unidirectional conductivity? A single PN junction is used independently, which is a diode and has unidirectional conductivity.

According to the use of the triode, it is not as simple as connecting two diodes, and it cannot be judged by a single conduction. If the two PN junctions are the same, then the difference between E and C is **ah? There is a little difference between the two, the forward resistance of the C pole is greater than the forward resistance of the E pole Test the triode with a multimeter (1) Distinguish the base and because the two PN sections are different.