Quasi-conductors are considered to be a special class of chemical elements. People got known about these materials in the end of the 19th century, but only in the 20th century scientists managed to get more knowledge about them. In 1923 Russian physicists proved the ability of utilizing of semiconductor-metal contacts to accelerate the producing of fluctuations. During further years igct 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. The intense research of the characteristics of semiconductors was begun at the same time.
Many physicists carry out a great deal of researches just to gain more knowledge about such characteristic of semiconductors as stimulated radiation. It caused the appearing of semiconductor laser device based on usage of p - n barriers and then on heterojunction.
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