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What is a semiconductor ? Describe the two main types of semiconductors and contrast their conduction mechanism.

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Solution :SUBSTANCES having conductance intermediate between those of CONDUCTORS (metals) and NON- conductors (insulators) are called semiconductors.
Two main types of semiconductors are n-type and p-type.
Solids doped with electron RICH impurities are n-type semiconductors while electron deficit semiconductors are p-type semiconductors.
While n-type semiconductors work by the movement of negative CHARGE (electrons), the p-type semiconductors work by the movement of positive charge (vacancies).


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