Charge Carriers in Semiconductors
- In the metal, the atoms are imbedded in a "sea" of free electrons, and these electrons can move as group under influence of the applied electric field.
- In semiconductors at the temperature 0 K, all states in valence band are full, and all states in conduction band are empty.
- At T > 0 K, electrons gets thermally excited from valence band to conduction band, and contributes to conduction process in the conduction band.
- The empty states left in the valence band can also contribute to the conduction of current.
- Also, the introduction of impurities has a significant effect on availability of the charge carriers.
- The flexibility in controlling electrical properties of the semiconductors.
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