4. ANN-PJUNCTION An abrupt Si n-p (note the order!) junction has a circular cross section with a diameter of 10m and the fol lowing properties : Nd =41016cm3, Na =1.51017cm3, and ni =1.51010cm3. Use the permittivity for silicon, si =11.80, where 0 is the vacuum permittivity. (A). Calculate the Fermi level positions in the n and p regions (EF Ei for n region and Ei EF for p region). Thencalculate the contact potentialV0, assuming the junction is in equilibrium. (B). Draw the equilibrium band diagram of the n-p junction, labeling the conduction and valence bands, intrinsic energy level, Fermi level, and contact potential. (C). CalculateW (depletion width), xn0, xp0,Q+ (total + charge in depletion region), and E0 (maximum value of the electric field)