There is a detached type of substances which is named quasi-conductors. This type was discovered in early 1980's but there were no needed technologies to carry on the further researches. The analysis of semiconductors was continued just in the 1920's. Russian physicists carried out lots of experiments. The results demonstrated that semiconductors can help to generate the fluctuations and maintain them. There was no possibility to develop some sophisticated devices as igbt modules. First transistor was created in Bell's laboratory in 1949. That event influenced the quick development of semiconductor devices. That was the beginning of the era of semiconductor technologies.
Many physicists perform a great deal of researches just to get more knowledge about such feature of semiconductors as stimulated emission. First laser system was developed with usage of semiconductors. The first version was based on p - n barriers, the latest ones - on heterojunction.
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