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A n-type semiconductor is:...

A n-type semiconductor is:

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As n-type semiconductor is obtained by doping pure Si or Ge-crystal with pentavalent impurity. As the impurity atoms enter into the configuration of the Si-crystal, its four electrons take part in covalent bonding, while the fifth electron is left free. Since each atom of the semiconductor and of impure substance as a whole is electrically neutral, the n-type Ge-crystal, though having large number of free electrons, is electrically neutral.
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