= Extrinsic semiconductor
An <extrinsic semiconductor> has mobile <electron> and <electron hole> populations substantially controlled by electrically active impurities rather than solely by intrinsic thermal pair production. <Donor impurities> favor electron conduction and <acceptor impurities> favor hole conduction. Ionization, compensation and the temperature-dependent intrinsic population determine whether a given doped specimen is actually in its extrinsic transport regime.
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