Intrinsic Semiconductors

If a semiconductor crystal contains no impurities, the only charge carriers present are those produced by thermal breakdown of the covalent bonds. The conducting properties are thus characteristic of the pure semiconductor. Such a crystal is termed an intrinsic semiconductor.

Extrinsic Semiconductors

If a semiconductor crystal contains n-type or p-type impurities, the conducting properties are chiefly due to the impurities. Such a crystal is termed an extrinsic semiconductor.

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