Question

Hole concentration variation is as shown in figure for a semiconductor, which of the following graph matches for diffusion hole current density?

Answer 1

$For{J}_p=-q{D}_p\frac{dp}{dx}$
$x\le w$
$\frac{dp}{dx}=\frac{p\left(0\right)-p_0}{0-w}=-\frac{p\left(0\right)-p_0}{w}=\text{positive}constant$
$forx\ge w$
$\frac{dp}{dx}=0$
$\Rightarrow J_p=0$