Question -
Doping of silicon (Si) with Arsenic (As) leads to
Options:
A .  n-type semiconductor
B .  p-type semiconductor
C .  Metal
D .  Insulator
Answer: Option A : A Arsenic has 5 valence electrons; 4 of them take part in covalent bond formation and the remaining one gets delocalized. This gives rise to an electron-rich impurity or n-type semiconductor.
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