A PN junction has Na=10^19 cm^-3 and Nd= 10^16 cm^-3. a) with V=0 what are the minority carrier densities at the depletion region edges? Assume V= 0.6 V for (b)-(d). b) What are the minority carrier densities at the depletion region edges? c) What are the excess minority carrier densities? d) What are the majority carrier densities? e) Under the reverse bias of 1.8 V, what are the minority carrier concentrations at the depletion region edges?