Using Eq. (5-8), calculate the contact potential V_0 of a Si p-n junction operating at 300 K for N_a = 10^14 and 10^19 cm^-3, with N_d = 10^14, 10^15, 10^16, 10^18, and 10^19 cm^-3 in each case, and plot V_0 vs. N_d