(a) For a pn junction with a cross-sectional area A 5 (10 m) 3 (20 m), fi nd the doping concentrations needed to ensure 0 5 0.7 V, as well as the resulting values of Em0, xp0, xn0, and Qj 0, under the...

(a) For a pn junction with a cross-sectional area A 5 (10 m) 3 (20 m), fi nd the doping concentrations needed to ensure 0 5 0.7 V, as well as the resulting values of Em0, xp0, xn0, and Qj 0, under the constraint ND 5 NA. (b) Repeat, but under the constraint ND 5 10NA. (c) Repeat, but under the constraint ND 5 0.1NA. Comment on your various results.