What is a semiconductor

If the substance is distinguished by conductivity, it can be roughly classified into two types: conductor or insulator. Generally speaking, the conductor is metal. Its conductivity will decrease with the increase of temperature, that is to say, the resistance will increase with the increase of temperature. In 1833, Faraday, the father of electronics, discovered that the resistance of silver sulfide is different from that of metal. With the increase of temperature, its resistance will decrease, that is, its conductivity will increase, This is the first time that human beings have discovered a substance with characteristics different from that of a conductor, or "non conductor" or "non insulator". This kind of substance is the so-called semiconductor, whose conductivity is much smaller than that of a conductor but better than that of an insulator. With the gradual development of science, semiconductors are also gradually emerging, leading the science and technology of the 20th century.