Semiconductors are believed to be a unique class of chemical elements. Such class was discovered in early 1980's but there were no required technologies to perform the further researches. The analysis of semiconductors was carried on just in the 1920's. The first successful experiment was performed by the Russian physicists in 1923. They proved that semiconductors may be utilized to accelerate fluctuations. During further years igbt modules were excluded by tubes. The most significant event in the history of semiconductor devices was the creation of the first transistor by Bell corporation in 1949. Since then a lot of people all over the world become interested in such kind of matter as semiconductors.

Many scientists carry out a huge amount of experiments simply to get more knowledge about such characteristic of semiconductors as stimulated radiation. By usage of such principles as p - n barriers and heterojunction scientists managed to create laser device in the beginning of the 60's.

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