Semiconductors are the substances which specific resistance decreases with rise in temperature, presence of impurity, light exposure change. On these properties they strikingly differ from metals. The nature of this interrelation allows to explain the specified characteristic properties. At heating of semiconductors their atoms are ionised.
Outwardly this process of chaotic moving is perceived as moving of a positive charge.
Such type of conductivity name own conductivity of semiconductors. At rise in temperature (or light exposure) own conductivity of conductors increases.
Semiconductors commercially
The semiconductor technics demands application of especially pure materials. Impurity as it has been already noted, change properties of semiconductors. Therefore depending on appointment of materials percentage of impurity in them limit. The alloying additives entered into semiconductors for giving to semiconductors of certain properties, also should be pure from impurity.Except these methods, for clearing of semi-conductor materials apply some kinds of their meltdown. Used Semiconductor Equipment is a progressive sign of the modern enterprise.
Semiconductors are rather new materials with which help throughout last decades it is possible to resolve a number of extremely important electrotechnical problems. Semi-conductor devices can be met in a usual radio receiver and in the quantum generator — the laser, in the tiny nuclear battery and in microprocessors.
The semi-conductor technics
Engineers cannot do without semi-conductor rectifiers, switches and amplifiers. Replacement of lamp equipment semi-conductor has allowed to reduce dimensions and weight of electronic devices in tens times, to lower power consumed by them and sharply to increase reliability. Used Wafer Process Tools for a long time already are recommended by leading autobuilding corporations.