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Semiconductors are considered to be a unique class of chemical elements. In the first time that unique type was found in the 1890’s but more thoroughly it started to be discovered just after the First World War in Europe and in Soviet Union. Russian physicists performed lots of researches. The results demonstrated that semiconductors may help to generate the fluctuations and maintain them. There was no possibility to develop some unique devices as semiconductor assembly. Only in the beginning of the 50’s with the appearing of transistors in 1949 the wide use of crystal detectors started. Since then a lot of persons all over the world become interested in such kind of substance as semiconductors.

The interest to optical characteristics of semiconductors revived because of research of induced emission in semiconductors. By means of such principles as p – n barriers and heterojunction physicists managed to design laser device in the beginning of the 60’s.

In case you need some hi-tech devices as for example asymmetric GTO thyristors, that is not a trouble, actually. There are lots of developers that offer such. Nowadays it is not possible to carry out any researches without some modern technologies which are based on use of semiconductors.

The conductivity of semiconductors lies in range between conductivity of metals and conductivity of isolators. That feature is produced the division of semiconductors as a divided class. There are several substances which are basically used to develop the semiconductor devices. They are germanium, selenium, silicon, etc.

For quite long period of time semiconductors haven’t got the attention of scientists and engineers. The first researches of semiconductors were started by well-known Russian scientist Abram Ioffe. He found that this wonderful sort of substance has got some unique characteristics and described how they can be utilized. Every semiconductor device has such main characteristics as electron and hole conduction. These features can be changed by means of adding some admixtures or changing temperature. For instance, by usage of some admixtures the value of electron conduction may be changed.

Almost every area of newest technologies implies use of semiconductors. Diodes, transistors and thyristors are the most frequently utilized systems. Their unique features are frequently utilized today, but they became spread just ten years ago. There is an ability to convert almost every type of energy into electric power by mans of semiconductors. Some of them are even able to produce cold and heat. Semiconductors perform the main functions in many different devices: atomic batteries, quantum generators, processors and even primitive radio receivers. Almost every engineer that works in organization related to electricity ought to know how important the voltage sensors are. The weight and overall dimensions of semiconductor systems are considerably smaller than their tube variants. When semiconductors are utilized some important characteristics as power and reliability are being developed a lot.

We can’t imagine how the humanity may do without lots of devices which are based on usage of semiconductors.