When an impurity is doped into an intrinsic semiconductor, the conductivity of the semiconductor
(a) increases
(b) decreases
(c) remains the same
(d) become zero.

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Solution

(a) increases

When an impurity (either a p-type atom or an n-type atom) is doped into an intrinsic semiconductor, it increases the number of charge carriers in the intrinsic semiconductor. As conductivity is directly related to the number of charge carriers, the conductivity of a semiconductor increases with doping.

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Which of the following statements are true about semiconductors ?

(a) Silicon doped with electron rich impurity is a p-type semiconductor

(b) Silicon doped with an electron rich impurity is an n-type semiconductor

(d) An electron vacancy increases the conductivity of n-type semiconductor

Silicon doped with electron-rich impurity forms .................

(a) P-type semiconductor (b) n-type semiconductor

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