(a) A pn junction has been doped with ND 5 1018/cm3 atoms of phosphorous and NA 5 1016/cm3 atoms of boron, and the voltage across its terminals has been adjusted for a forward current of 1.0 mA. If...

(a) A pn junction has been doped with ND 5 1018/cm3 atoms of phosphorous and NA 5 1016/cm3 atoms of boron, and the voltage across its terminals has been adjusted for a forward current of 1.0 mA. If you were to observe this current right inside the SCL, what fraction of it would be due to electron fl ow, and what fraction to hole fl ow? Hint: use the formulas of, and assume nyp 5 1 for simplicity. (b) Repeat if ND 5 1016/cm3 and NA 5 1018/cm3 . (c) Assuming NA 5 1017/cm3 and n 5 1.6p, fi nd the value of ND needed to make electron fl ow and hole fl ow equal inside the SCL.