Question 5 Consider a step pn junction made of GaAs at T = 300 K. The junction capacitance at zero bias is C(0) and the capacitance with a 10 V reverse bias is C(10). The ratio of the capacitance was measured to be C(0)/C(10) = 3.13. Find the doping density, N_DND in the n-side in unit of cm -3 Answers within 5% error will be considered correct.