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Semiconductors are believed to be a unique class of chemical elements. In the first time that unique class was discovered in the 1890's but more thoroughly it began to be researched just after the First World War in Europe and in Soviet Union. The first successful experiment was carried out by the Russian scientists in 1923. They proved that semiconductors can be used to accelerate fluctuations. There was no possibility to create some unique devices as semiconductor assembly. First transistor was developed in Bell's laboratory in 1949. This event influenced the fast development of semiconductor devices. Since then many people all over the world become interested in such kind of substance as semiconductors.

Stimulated emission is actually a very interesting characteristic of semiconductors that has been discovered for several tens of years. First laser device was developed with usage of semiconductors. The first variant was based on p - n barriers, the latest ones - on heterojunction.

Today we can see a huge amount of different power semiconductor devices which operate with assistance of usage of semiconductors. If there were no semiconductor devices utilized in the newest technologies, we won't have a possibility to perform such great researches which are significant for other sciences.

The conductivity of semiconductors is situated in range between conductivity of metals and conductivity of isolators. That characteristic is caused the division of semiconductors as a divided type. There are several elements that are basically used to develop the semiconductor devices. They are germanium, selenium, silicon, etc.

It sounds a bit strange but physicists didn't want to perform researches of semiconductors for a long time. The first experiments of semiconductors were started by well-known soviet scientist Abram Ioffe. He found that semiconductors are the special class of crystals with some unique characteristics. There are electron conduction and hole conduction provided by semiconductor devices. The features of semiconductor are related to the conditions they are situated. For example, by usage of some admixtures the value of electron conduction may be modified.

Almost every area of modern technologies implies use of semiconductors. Diodes, transistors and thyristors are the most often used systems. Semiconductors are widely utilized as their features are useful for almost every electronic device. There are systems based on semiconductors that can convert light and heat energy into electricity and vice versa. Several of them are even able to develop cold and heat. Semiconductors execute the basic functions in lots of different devices: atomic batteries, quantum generators, processors and even primitive radio receivers. Workers can't do without semiconductor rectifiers, changers, disconnectors and amplifiers. In case we match devices equipped with semiconductors and tube systems we can see that semiconductors are significantly smaller and lighter. The analogue devices are not equal in case we speak about their reliability and power. Tube drops behind.

Day after day we can hear about some modern systems which help humanity to have more conveniences or even save the life.

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