There is a divided type of matters which is called quasi-conductors. At first that unique class was found in the 1890's but more thoroughly it started to be discovered only after the First World War in Europe and in Soviet Union. Russian physicists carried out a lot of experiments. The results showed that semiconductors may assist to accelerate the fluctuations and maintain them. There was no possibility to create some sophisticated devices as igbt modules. The most significant event in the history of semiconductor devices was the invention of the first transistor by Bell company in 1949. That was the beginning of the epoch of semiconductor technologies.

The interest to optical characteristics of semiconductors revived because of research of simulated emission in semiconductors. First laser system was developed with usage of semiconductors. The first variant was based on p - n barriers, the latest ones - on heterojunction.

Modern producers may propose a broad spectrum of different semiconductor devices to their consumers, for instance asymmetric GTO thyristors. If there were no semiconductor devices utilized in the newest technologies, we won't have an opportunity to carry out such nice researches that are important for other sciences.

The conductivity of semiconductors lies in range between conductivity of metals and conductivity of isolators. This characteristic is caused the division of semiconductors as a divided type. There are some substances that are mainly used to develop the semiconductor devices. They are germanium, selenium, silicon, etc.

For very long period of time semiconductors haven't drawn the attention of scientists and engineers. Abram Ioffe is a soviet scientist that began carrying out various researches in field of semiconductors. He found that semiconductors are the divided type of crystals with some definite characteristics. Any semiconductor device has got such basic features as electron and hole conduction. These characteristics may be modified by usage of adding some admixtures or changing temperature. The admixtures affect significantly on the electron conduction of the semiconductors.

Almost every area of newest technologies implies use of semiconductors. Diodes, transistors and thyristors are the most frequently utilized devices. Semiconductors are widely utilized as their features are helpful for almost every electric system. They are used to turn light and heat energy into electric energy and vice versa. With help of electric power they may create heat and cold. Semiconductor devices can be used in radio receiver and quantum generator, in small atomic battery and in microprocessors. Workers can't do without semiconductor rectifiers, changers, current sensors and amplifiers. The usage of semiconductors instead of tube devices allows to lower the overall dimensions and masses of electronic devices. The analogue devices are not equal if we speak about their reliability and power. Tube drops behind.

We can't imagine how the humankind can exist without lots of devices which are based on utilizing of semiconductors.

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