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Semiconductor Device Theory

  Semiconductor Device Theory, in electrical engineering, is based on the principle that the conductivity of the semiconductor material—how well it allows electricity to flow—can be controlled over wide limits by varying the concentration of impurities added to the pure semiconductor. Semiconducting materials, as their name implies, have conductivities between those of good conductors (such as metals) and good insulators (such as most plastics).

The real semiconductor revolution did not occur until 1947 when J. Bardeen and W.H. Brattain invented the transistor. The transistor, or ‘transfer resistor’, could be used as both an electrical amplifier and oscillator and offered greater reliability and performance over the electronic valve devices it replaced. AC



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