Question

When an impurity is doped into an intrinsic semiconductor, the conductivity of the semiconductor

• A. increases
• B. decreases
• C. remains the same
• D. becomes zero

Answer 1

The correct option is A increases

The conductivity in an intrinsic semiconductor is due to the thermal motion of bound electrons. But extrinsic semiconductor contains more number of free electrons in case of n-type (and free holes in p-type) due to which the current flows. Thus conductivity of intrinsic semiconductor is more than that of extrinsic.