Injection of excess holes at x = 0 in a sample placed on the positive x-axis from x = 0 to x = 00 causes a current given by: Ip (x = 0) = qADAp Lp where Lp = DpTp is the diffusion length. Show that his is the current needed to maintain a charge carrier profile in the figure below and described by the equation: Ap p(x)= Po + Ape p P.(x) Po 0 Figure 2: Charge carrier profile