The total current density in a semiconductor is constant and equal to $=10/2.$ The total

current is composed of a hole drift current and electron diffusion current. The hole

concentration is constant at $=10163,$ and the electron concentration is given by

$()=21015$ exp$(/15)3.$ The electron diffusion coefficient is $=272$

and the hole mobility is $=4202.$

Calculate:

a$)$ The electron diffusion current density for x$>0.$

b$)$ The hole drift current for x$>0.$

c$)$ The required electric field for x$>0$