Keywords: SCR, protective devices, transistors
Semiconductor (semiconductor) refers to a material whose conductivity is between a conductor and an insulator at room temperature.
Semiconductors are used in integrated circuits, consumer electronics, communication systems, photovoltaic power generation, lighting, high-power power conversion and other fields. For example, diodes are devices made of semiconductors.
Whether from the perspective of technology or economic development, the importance of semiconductors is very huge. Most electronic products, such as computers, mobile phones or digital recorders, are closely related to semiconductors.
Common semiconductor materials are silicon, germanium, gallium arsenide, etc., and silicon is the most influential one in various semiconductor materials applications.
Matter exists in a variety of forms, solid, liquid, gas, plasma and so on. We usually refer to materials with poor conductivity, such as coal, artificial crystals, amber, ceramics, etc., as insulators. The better conductive metals such as gold, silver, copper, iron, tin, aluminum, etc. are called conductors. A material between a conductor and an insulator can be simply referred to as a semiconductor. Compared with conductors and insulators, the discovery of semiconductor materials was the latest. It was not until the 1930 s that the existence of semiconductors was truly recognized by academia when the purification technology of materials was improved.
A semiconductor refers to a material whose conductivity is between a conductor and an insulator at room temperature. A semiconductor is a material whose conductivity can be controlled, ranging from an insulator to a conductor. From the perspective of science and technology and economic development, semiconductors affect people's daily work and life, and this material was not recognized by academia until the 1930 s.
Semiconductors are used in integrated circuits, consumer electronics, communication systems, photovoltaic power generation, lighting applications, high-power power conversion and other fields. Photovoltaic Applications The photovoltaic effect of semiconductor materials is the basic principle of solar cell operation. At present, the photovoltaic application of semiconductor materials has become a hot topic, and it is the fastest growing and best developing clean energy market in the world. The main production materials of solar cells are semiconductor materials. The main criterion for judging the merits of solar cells is the photoelectric conversion rate. The higher the photoelectric conversion rate, the higher the working efficiency of solar cells. According to the application of different semiconductor materials, solar cells are divided into crystalline silicon solar cells, thin film batteries and III-V compound batteries.  Lighting application LED is a semiconductor light-emitting diode based on a semiconductor transistor. Using LED technology, the semiconductor light source is small in size, can realize flat packaging, low heat generation, energy saving and high efficiency, long product life, fast response speed, and green environmental protection. No pollution, it can also be developed into a light, thin and short product. Once it comes out, it will be rapidly popularized and become a new generation of high-quality lighting source, it is now widely used in our lives. Such as traffic lights, electronic products backlight, urban night landscape beautification light source, indoor lighting and other fields, have applications.  high-power power conversion of alternating current and direct current conversion for the use of electrical appliances is very important, is the necessary protection of electrical appliances. This will use such as power conversion device. Silicon carbide has high breakdown voltage, wide band gap and high thermal conductivity, so SiC semiconductor devices are very suitable for applications in high power density and switching frequency, and power conversion device is one of them. Another performance of silicon carbide components in high temperature, high pressure and high frequency makes it widely used in deep well drilling, inverters in power generation devices, energy converters of electric hybrid vehicles, and traction power conversion of light rail trains. Due to the advantages of SiC itself and the need for lightweight and high conversion efficiency semiconductor materials in the industry at this stage, SiC will replace Si and become the most widely used semiconductor material.
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