Semiconductor is a material with conductivity between conductor and insulator at room temperature, and it is also a material with controllable conductivity from insulator to conductor.
Semiconductors have applications 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. The development of semiconductors is one of the core indicators to measure a country's scientific and technological development level, and it belongs to an industry that the country attaches great importance to and encourages.