Conference on Mobile Information Systems

Semiconductors are believed to be a special class of chemical elements. Scientists got known about such materials in the end of the 19th century, but only in the 20th century scientists managed to obtain more knowledge about them. The first successful experiment was performed by the Russian scientists in 1923. They proved that semiconductors can be used to accelerate fluctuations. During several years igbt modules were ejected by tubes. The most significant event in the history of semiconductor devices was the creation of the first transistor by Bell corporation in 1949. That was the start of the epoch of semiconductor technologies.

The concern to optical characteristics of semiconductors revived due to research of induced emission in semiconductors. The first laser device was created with utilizing of semiconductors. The first version was based on p - n barriers, the latest ones - on heterojunction.

Modern developers can offer a wide range of variant semiconductor devices to their customers, for instance asymmetric GTO thyristors. Nowadays it is not possible to carry out any researches without some new technologies that are founded on usage of semiconductors.

Semiconductors are a broad class of substances that are characterized by the value of conductivity which lies between the conductivities of metals and isolators. There are some substances that are mainly utilized to create the semiconductor devices. They are germanium, selenium, silicon, etc.

It sounds a little strange but scientists didn't want to carry out experiments of semiconductors for a long time. The first experiments of semiconductors were started by well-known Russian scientist Abram Ioffe. He found that this amazing sort of substance has some special characteristics and determined how they may be utilized. Any semiconductor device has got such basic features as electron and hole conduction. The characteristics of semiconductor are related to the conditions they are situated. To get the features that are needed for the experiment or appropriate use of device some admixtures are added to semiconductors.

Almost every area of newest technologies means usage of semiconductors. Diodes, transistors and thyristors are the most often utilized systems. The wide application of semiconductors started not so long ago but today they are truly widely utilized. There are systems based on semiconductors that can convert luminous and heat energy into electric power and vice versa. Some of them are even able to develop cold and heat. Such systems as radio receivers, atomic batteries, quantum generator, microprocessors etc comprise semiconductors. Almost every worker that works in organization connected to electricity ought to realize how important the power resistors are. If we match devices operating on semiconductors and tube devices we can realize that semiconductors are considerably smaller and lighter. When semiconductors are used some important characteristics as power and reliability are being developed a lot.

There are a lot of various devices today, which considerably ease our life and all these inventions appear only owing to the semiconductor devices.