In an extrinsic semiconductor,the number dens | vedclass

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(D) An extrinsic semiconductor is formed by doping an intrinsic semiconductor with impurities.If the semiconductor is $p$-type,it is doped with trival

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${N_p} > {N_e}$ or ${N_p} < {N_e}$ depends on the type of impurity.

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(D) An extrinsic semiconductor is formed by doping an intrinsic semiconductor with impurities.If the semiconductor is $p$-type,it is doped with trivalent impurities,resulting in ${N_p} > {N_e}$.If the semiconductor is $n$-type,it is doped with pentavalent impurities,resulting in ${N_e} > {N_p}$ (or ${N_p} Therefore,the relationship between ${N_p}$ and ${N_e}$ depends on the type of impurity added to the semiconductor.

In an extrinsic semiconductor,the number densities of holes and electrons are ${N_p}$ and ${N_e}$ respectively. Then:

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