There is a divided type of substances that is named quasi-conductors. This type was researched in early 1980's but there were no needed technologies to carry on the further researches. The analysis of semiconductors was carried on just in the 1920's. In 1923 Russian scientists proved the ability of usage of semiconductor-metal contacts to quicken the generation of fluctuations. During several years semiconductor assembly were ejected by tubes. First transistor was created in Bell's laboratory in 1949. This event impacted on the fast improvement of semiconductor devices. Since then a lot of people all over the world become interested in such type of matter as semiconductors.
Stimulated emission is really a quite interesting feature of semiconductors that has been discovered for several tens of years. First laser system was created with usage of semiconductors. The first variant was based on p - n barriers, the latest ones - on heterojunction.
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