Quasi-conductor are the divided class of substances. Such type was researched in early 1980's but there were no needed technologies to perform the further experiments. 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 generate fluctuations. During further years igbt modules were excluded by tubes. The most considerable event in the history of semiconductor devices was the invention of the first transistor by Bell corporation in 1949. That was the start of the epoch of semiconductor technologies.
The concern to optical features of semiconductors revived due to discovery of simulated 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.
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