Quasi-conductors are considered to be a unique class of chemical elements. Such type was researched in early 1980's but there were no needed technologies to perform the further experiments. The research of semiconductors was continued only in the 1920's. Russian physicists carried out lots of experiments. The results demonstrated that semiconductors can assist to generate the fluctuations and maintain them. There was no possibility to develop some sophisticated devices as semiconductor assembly. Just in the beginning of the 60's with the invention of transistors in 1949 the wide use of crystal detectors began. The intensive research of the features of semiconductors was started at the same time.

Many physicists perform a huge amount of researches just to gain more knowledge about such feature of semiconductors as stimulated radiation. First laser system was created with usage of semiconductors. The first variant was based on p - n barriers, the latest ones - on heterojunction.

Nowadays we may see a huge amount of various pulsed power devices that work with help of usage of semiconductors. Semiconductor matters have been researched for not so long but radio electronics and lots of other sciences can't do without utilizing of them.

The conductivity of semiconductors lies in diapason between conductivity of metals and conductivity of isolators. That feature is produced the division of semiconductors as a divided class. Such matters as germanium, silicon, selenium and several others are considered to be semiconductors.

Physicists haven't been interested in semiconductors for very long period of time. Abram Ioffe is a Russian scientist that began carrying out various experiments in field of semiconductors. He noticed that this amazing sort of substance has some special features and described how they can be utilized. Any semiconductor device has such basic features as electron and hole conduction. The characteristics of semiconductor are dependant on the conditions they are placed. For instance, by utilizing of some admixtures the value of electron conduction may be modified.

The most important semiconductor systems that are used in technologies are diodes, transistors and thyristors which are based on materials with electron and hole conductions. Semiconductors are widely utilized as their characteristics are helpful for almost every electric system. They are able to transform luminous and heat energy into electric energy and vice versa. Heat and cold can be produced by some types of semiconductors. Semiconductors execute the basic functions in lots of different devices: atomic batteries, quantum generators, processors and even simple radio receivers. Engineers can't do without semiconductor rectifiers, changers, current sensors and amplifiers. The mass and overall dimensions of semiconductor devices are considerably smaller than their tube analogues. The analogue devices are not equal in case we talk about their reliability and power. Tube drops behind.

Day after day we may hear about some modern systems which assist humanity to have more conveniences or even save the life.

Tags: current-sensors, diodes, fuses, igbt-modules, power-resistors, semiconductor-assembly