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SEMICONDUCTORS Materials that have electrical conductivity between…
SEMICONDUCTORS Materials that have electrical conductivity between conductors and insulators are called semiconductors. They have small forbidden gaps and they conduct moderately at room temperature. They behave as an insulator when the energy provided is less than the forbidden gap. They are of two types.
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TRANSISTOR
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• 3-regions(emitter, base, collector)
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Two types of transistors. 
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FORMATION OF DIODE
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made from the semiconductor materials such as silicon, germanium, and gallium arsenide.