There is a detached class of matters that is named semiconductors. At first that unique type was discovered in the 1890's but more completely it started to be discovered only after the First World War in Europe and in Soviet Union. The first successful research was carried out by the Russian scientists in 1923. They proved that semiconductors may be utilized to generate fluctuations. There was no opportunity to develop some sophisticated devices as diodes. Just in the beginning of the 60's with the appearing of transistors in 1949 the wide use of crystal detectors began.
The intensive research of the characteristics of semiconductors was begun at the same time. Induced emission is really a quite interesting feature of semiconductors that has been researched for several tens of years. It led to the appearing of semiconductor laser system based on utilizing of p ? n barriers and then on heterojunction. Modern producers may offer a broad range of different semiconductor devices to their customers, for example pulsed power devices. Nowadays it is not possible to perform any researches without some modern technologies that are founded on use of semiconductors.
The main reason why semiconductors are considered to be the divided kind is that they have got a conductivity which is between the conductivities of metals and isolators. There are some elements that are mainly utilized to create the semiconductor devices. They are germanium, selenium, silicon, etc.
It sounds a bit strange but scientists didn't want to perform researches of semiconductors for a long time. The first researches of semiconductors were begun by well-known Russian physicist Abram Ioffe. He found that semiconductors are the divided class of crystals with some unique features. There are electron conduction and hole conduction provided by semiconductor systems. These features may be modified by means of adding some admixtures or changing temperature.
The admixtures influence significantly on the electron conduction of the semiconductors. Almost every area of modern technologies implies usage of semiconductors. Diodes, transistors and thyristors are the most frequently used systems. Their unique characteristics are widely used nowadays, but they became widespread just ten years ago.
There are systems based on semiconductors which may convert light and heat energy into electric power and vice versa. With help of electricity they can develop heat and cold. Semiconductors perform the main functions in many different devices: atomic batteries, quantum generators, processors and even primitive radio receivers.
Almost every engineer that works in company connected to electricity should realize how significant the power resistors are. The weight and size of semiconductor devices are considerably smaller than their tube variants. When semiconductors are used some significant characteristics as power and reliability are being improved a lot. We can't imagine how the humankind can do without a lot of devices which are based on utilizing of semiconductors.
There are a lot of producers of asymmetric GTO thyristors which are located all over the world. The market of such devices is full of various productions but not every producer can propose the sufficient value of quality. Every customer ought to realize that it is hazardous to get bad power resistors as it can produce some awful consequences.