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Second, what is a semiconductor

semiconductor refers to a material whose electrical conductivity at room temperature is between a conductor and an insulator. Diodes, for example, are devices made of semiconductors. A semiconductor is a material whose electrical conductivity can be controlled, ranging from insulator to conductor.

Whether from the perspective of technology or economic development, the importance of semiconductors is very huge. The core units in most of today’s 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 one of the most influential in commercial applications among various semiconductor materials.

Matter exists in many forms, solid, liquid, gas, plasma, etc. We usually refer to materials with poor electrical conductivity, such as coal, artificial crystals, amber, ceramics, and so on, as insulators. The relatively good electrical conductivity of metals such as gold, silver, copper, iron, tin, aluminum and so on called conductors. The material between a conductor and an insulator can simply be called a semiconductor