There is a divided type of matters that is called quasi-conductors. At first this unique class was discovered in the 1890's but more completely it began to be researched only after the First World War in Europe and in Soviet Union. Russian scientists carried out lots of researches. The results showed that semiconductors may help to accelerate the fluctuations and maintain them. There was no opportunity to develop some unique devices as diodes. Just in the beginning of the 60's with the appearing of transistors in 1949 the wide use of crystal detectors started. Since then many people all over the world become interested in such type of matter as semiconductors.
Many physicists perform a huge amount of experiments just to gain more knowledge about such characteristic of semiconductors as stimulated radiation. It led to the appearing of semiconductor laser device based on usage of p - n barriers and then on heterojunction.
current sensors diodes fuses igbt modules power resistors semiconductor assembly