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Question
Silicon doped with electron-rich impurity forms ______.
Options
p-type semiconductor
n-type semiconductor
intrinsic semiconductor
insulator
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Solution
Silicon doped with electron-rich impurity forms n-type semiconductor.
Explanation:
Silicon has four valence electrons. If it is doped with an electron rich impurity, the extra electron becomes delocalised and increases the conductivity. Since the increase in conductivity is due to negatively charged electron, hence it is called n-type semiconductor.
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