Problems-3: [2x6=12pts] (P-N junction's reverse bias condition) Consider the PN junction from the previous question. Assume that now a reverse voltage of Vr=3 V is applied. Answer the following questions.

a. Draw the Fermi level positions and band diagram across the PN junction. b. Calculate the depletion region width. c. Draw the electric field profile. Mark the value of maximum (magnitude) of the electric field. d. Draw the potential (or voltage) profile across the PN junction. Mark the value of built-in voltage (Obi).