Quasi-conductor are the detached type of matters. People got known about such substances in the end of the 19th century, but just in the 20th century scientists managed to get more knowledge about them. The first successful research was carried out by the Russian physicists in 1923. They proved that semiconductors can be utilized to accelerate fluctuations. But such devices as igbt modules that are used today were invented considerably later. Only in the beginning of the 60's with the invention of transistors in 1949 the broad use of crystal detectors started. That was the beginning of the epoch of semiconductor technologies.

Induced emission is actually a very interesting feature of semiconductors that has been discovered for several tens of years. By usage of such principles as p - n barriers and heterojunction physicists managed to create laser system in the beginning of the 60's.

Modern producers can offer a broad range of variant semiconductor devices to their customers, for instance pulsed power devices. Nowadays it is impossible to perform any researches without some new technologies which are based on usage of semiconductors.

The main reason why semiconductors are considered to be the divided class is that they have got a conductivity that is between the conductivities of metals and isolators. There are several substances which are basically utilized to create the semiconductor devices. They are germanium, selenium, silicon, etc.

Physicists haven't been interested in semiconductors for quite a long period of time. The first researches of semiconductors were begun by famous Russian scientist Abram Ioffe. That genius proposed many techniques of usage of semiconductors and every modern system is based on these principles. There are electron conduction and hole conduction developed by semiconductor systems. The features of semiconductor are dependant on the conditions they are placed. For instance, by usage of some admixtures the value of electron conduction can be changed.

Almost every sphere of modern technologies means usage of semiconductors. Diodes, transistors and thyristors are the most often used devices. Semiconductors are widely used as their characteristics are helpful for almost every electronic device. There is a possibility to convert almost every kind of energy into electric power by usage of semiconductors. Some of them are even able to produce cold and heat. Such devices as radio receivers, atomic batteries, quantum generator, microprocessors etc comprise semiconductors. Almost every worker who works in company connected to electricity ought to know how significant the voltage sensors are. The mass and size of semiconductor systems are significantly smaller than their tube variants. When semiconductors are used some significant characteristics as power and reliability are being developed much.

From day to day we can hear about some modern inventions which assist humanity to have more conveniences or even save the life.

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