Effect of ionization of impurity centres by electric field on the conductivity of superlattice

摘要

The study of the effect of ionization of impurity centres by electric field E(sub 0) on the conductivity of superlattice (SL) has been studied theoretically. It is observed that as the field E(sub 0) increases the current rises reaches a maximum then falls off i.e. show a negative differential conductivity (NDC). Further increase in E(sub 0) leads to an exponential rise of the current. This occur around E(sub 0) = 3 x 10(sup 4)V cm(sup -1). Hence the current density field shows a ''N'' shape characteristics as against the ''n'' shape characteristics in the absence of impurity. (author). 23 refs, 3 figs. (Atomindex citation 26:039622)