(a) is intrinsic. (b) has trivalent impurity atoms added. (c) has pentavalent impurity atoms added. (d) requires no doping.
Answer
Answer : (c)
Explanation
Explanation : N-type Semiconductor : An intrinsic semiconductor material is a poor conductor. When a small amount of pentavalent impurity is added to the intrinsic material its conductivity rises sharply. This material formed after the addition of pentavalent impurity to the intrinsic semiconductor material is called N-type material. Addition of small amount of pentavalent atoms in the intrinsic material provides large number of free electrons for conduction. Let us discuss.
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