At what electron and hole concentrations is the resistivity of a semiconductor a maximum? Give numerical values for Si at 300K.
Note in practice one cannot refine Si to such a purity, however, this can occur in a p/n junction where NDD=NAA and p=n=ni at the intrinsic or p/n boundary.
However, the resistivity is an irrelevant quantity in the space-charge layer of a p/n Junction.