(1) Elemental semiconductors. Elemental semiconductors refer to semiconductors composed of a single element, among which the research on silicon and selenium is relatively early. It is a solid material composed of the same elements with semiconducting properties, which is easily changed by trace impurities and external conditions. At present, only silicon and germanium have good performance and are widely used. Selenium is used in the fields of electronic lighting and optoelectronics. Silicon is widely used in the semiconductor industry, which is mainly affected by silicon dioxide, which can form a mask in device manufacturing, improve the stability of semiconductor devices, and facilitate automated industrial production. 
(2) Inorganic composite semiconductors. Inorganic composites are mainly composed of a single element to form a semiconductor material. Of course, there are also semiconductor materials composed of multiple elements. The main semiconductor properties are Group I and Group V, VI, VII; Group II and Group IV, V, VI, VII; III Groups and Groups V and VI; Groups IV and Groups IV and VI; Groups V and Group VI; Groups VI and Group VI are combined compounds, but affected by the characteristics and production methods of the elements, not all compounds can meet the requirements of semiconductor materials. requirements. This semiconductor is mainly used in high-speed devices. The speed of transistors made by InP is higher than that of other materials, and it is mainly used in optoelectronic integrated circuits and anti-nuclear radiation devices. For materials with high conductivity, it is mainly used in LED and other aspects. 
(3) Organic synthetic semiconductors. Organic compounds refer to compounds containing carbon bonds in the molecule. The organic compound and the carbon bond are vertically stacked to form a conduction band. Through chemical addition, it can be allowed to enter the energy band, so that conductivity can occur, thereby forming organic compound semiconductors. Compared with previous semiconductors, this semiconductor has the characteristics of low cost, good solubility, and easy processing of light materials. The conductivity can be controlled by controlling the molecules, and it has a wide range of applications, mainly used in organic thin films, organic lighting, etc.