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There are many forms of matter, such as solid, liquid, gas, plasma and so on. We usually call materials with poor conductivity, such as coal, artificial crystal, amber, ceramics and so on, insulators. Metals with good conductivity, such as gold, silver, copper, iron, tin and aluminum, are called conductors. The material between conductor and insulator can be simply called semiconductor. Compared with conductors and insulators, the discovery of semiconductor materials is the latest. Until the 1930s, when the purification technology of materials was improved, the existence of semiconductors was really recognized by the academic community.

According to the news from zhidongxi on June 28, according to money DJ in Taiwan, China, the cumulative sales of semiconductor equipment in Japan exceeded RMB 75.6 billion in May this year, the highest in the same period over the years

The successful first flight of the C919 large passenger plane made many people excited. However, some different voices also appeared on the Internet: saying that many parts of this aircraft are imported goods, and some even said that the Chinese C919 just made a shell.

Semiconductors are widely used in consumer electronics, communication systems, medical instruments and other fields. For example, diodes are devices made of semiconductors. The importance of semiconductors is enormous in terms of technology and economic development

IC refers to integrated circuits. In semiconductor, semiconductor is the most suitable material to realize transistor, and transistor is the core device of most circuits. But I want to write more here, starting from the beginning of "circuit". In physics class, everyone heard that Maxwell's equation predicted the existence of electromagnetic wave, and then Hertz's experiment proved the existence of electromagnetic wave. Finally, Marconi realized radio communication

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