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N-type semiconductor

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N-type semiconductor

    • Posted by Surya Pratap Singh 6 years, 3 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 6 years, 3 months ago

    n-type semiconductor

    • When pure Si or Ge which has four valency electrons is doped with controlled amount of pentavalent atoms, like Arsenic, Phosphorus, Antimony or Bismuth, we get a n-type semiconductor
    • The four valence electron from the impure atom will combine with four electrons of the Si or Ge atom to form 4 covalent bonds
    • The fifth electron of the impure atom is free to move. Thus, each atom of the impure substance, donates a free electron for conduction. Hence, it is called as donor atom
    • Giving the free electron for conduction, the impure atom becomes positively charged, giving rise to a hole
    • Thus in n-type semiconductors, electrons are the majority carriers and holes are minority carriers

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