Discoveries of Russian Scientists
Posted on October 20, 2008 by admin, under Electronic Technologies.
The material for semiconductors mainly has the electrical resistance among that of a conductor and a non-conductor. The resistance of semi-conductors also is affected by changes in temperature or added “impurities”.
The term “dashes” means the other substances mixed to the material. The complete mixture labels the semiconductors as power semiconductor devices of type-n and type-t.
They manufacture diodes and transistors applying both these types of semiconductors. Mainly silicon is used to create semiconductors now.
In order to keep the flow of electrical current in only one sense diodes are applied. They are created of semi-conductor substance. There is a component of + (positive) combination, - (negative) combination and so-called pn-transfer known as barrier level in each diode. Electrical circuits which change between alternating and direct current are created with diodes. Because that diodes make current go only in one sense only half of the processes or cycle passes by. Rectifier is the expression for such a construction.
LED (light diodes) is one more kind of diodes. Such diodes are used in case it's a task to create light at little voltages and at the same time make no warmth. Such diodes are present in all units of up-to-date electronic equipment for example tv sets or stereo units specially to sign the standby state.
The extent of thyristors manufactures was governed by Moore's law. Lithography is the most important point of making complex power semiconductor gadgets at smaller price. For optical lithography is already outdated, there's these days a tendency for other technologies. It is now quickly being substituted by more up-to-date ultraviolet lithography and nano-imprint lithography. (more…)
The History of Semiconductor Devices
Posted on June 25, 2008 by admin, under Science & Progress.
Semiconductors are believed to be a special class of chemical elements. In the first time that unique class was found in the 1890's but more thoroughly it started to be researched just 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 used to generate fluctuations. There was no opportunity to create some sophisticated devices as igct. Just in the beginning of the 60's with the invention of transistors in 1949 the wide use of crystal detectors started. That was the start of the era of semiconductor technologies.
Many scientists carry out a huge amount of experiments simply to gain more knowledge about such feature of semiconductors as stimulated emission. It caused the creation of semiconductor laser device based on usage of p - n barriers and then on heterojunction.
