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According to the base material, PCB can be divided into flexible circuit board, rigid circuit board and rigid flexible combination plate, which are used in different equipment according to different purposes.

After the invention and mass production of transistors, various solid-state semiconductor components such as diodes and transistors were widely used, replacing the functions and roles of vacuum tubes in circuits. By the middle and late 20th century

Semiconductors refer to materials with conductivity between conductor and insulator at room temperature. Common semiconductor materials include silicon, germanium, gallium arsenide, etc. Silicon is the most influential one in the application of various semiconductor materials

After the board surface is oxidized, a fluff layer (copper oxide and cuprous oxide) is formed.

The advantages of heavy copper PCB make it the top priority for the development of high-power circuits. The heavy copper concentration can handle high power and high heat, which is why high-power circuits have been developed using this technology. Such circuits cannot be developed with low-copper concentration PCBs because they cannot withstand the huge thermal stresses caused by high currents and flowing currents.

A semiconductor is a substance with a conductivity between that of a conductor and an insulator. It is not very conductive in a pure state, but its conductivity can be adjusted by adding impurities (doping) or changing the temperature. The typical representative of semiconductors is silicon, which is widely used in the manufacturing of electronic components. Semiconductor technology is the cornerstone of modern electronic devices, such as smartphones, computers, digital cameras, etc., all rely on semiconductor chips. In addition, semiconductors are also very important in the energy field, such as semiconductor materials, which are the core of solar cells