Quasi-conductor are the divided class of substances. People got known about these substances in the end of the 19th century, but only in the 20th century scientists managed to obtain more knowledge about them. The first successful research was carried out by the Russian scientists in 1923. They proved that semiconductors may be utilized to accelerate fluctuations. But such devices as igbt modules that are used nowadays were created considerably later. Only in the beginning of the 50's with the invention of transistors in 1949 the broad use of crystal detectors started. Since then a lot of persons all over the world become interested in such type of substance as semiconductors.

Induced emission is actually a quite interesting feature of semiconductors that has been researched for several tens of years. First laser system was developed with utilizing of semiconductors. The first variant was based on p - n barriers, the latest ones - on heterojunction.

Today we may see a huge amount of various asymmetric GTO thyristors that work with assistance of use of semiconductors. Today it is impossible to carry out any researches without some modern technologies which are founded on use of semiconductors.

The conductivity of semiconductors lies in diapason between conductivity of metals and conductivity of isolators. This feature is produced the division of semiconductors as a divided type. Such matters as germanium, silicon, selenium and several others are considered to be semiconductors.

Physicists haven't been interested in semiconductors for very long period of time. The first researches of semiconductors were begun by well-known soviet scientist Abram Ioffe. He noticed that this wonderful type of substance has got some unique characteristics and determined how they may be utilized. Any semiconductor device has such main features as electron and hole conduction. The features of semiconductor are dependant on the conditions they are placed. The admixtures affect significantly on the electron conduction of the semiconductors.

Almost every sphere of newest technologies means use of semiconductors. Diodes, transistors and thyristors are the most frequently used devices. Their unique characteristics are widely used nowadays, but they became widespread only ten years ago. There are systems based on semiconductors which can convert luminous and heat energy into electricity and vice versa. With usage of electricity they may develop heat and cold. Semiconductors execute the basic functions in many various devices: atomic batteries, quantum generators, processors and even primitive radio receivers. Engineers can't do without semiconductor rectifiers, changers, fuses and amplifiers. The usage of semiconductors instead of tube systems permits to reduce the overall dimensions and weight of electronic systems. When semiconductors are used some significant features as power and reliability are being developed much.

We can't imagine how the humanity can exist without a lot of devices that are based on utilizing of semiconductors.

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