3.13 Calculate the built-in voltage of a junction in which the p and n regions are doped equally with 5 × 1016 atoms/cm3. Assume ni = 1.5 × 1010/cm3. With the terminals left open, what is the width of the depletion region, and how far does it extend into the p and n regions? If the cross-sectional area of the junction is 2 µm2, find the magnitude of the charge stored on either side of the junction.
778 mV; 0.2 m; 0.1 m; 0.1 m; 1.6 × 10−15 C