Problem $3(2+2$ points$)$

Consider a Si p$-$n junction at T$=300$K with the following parameters:

Na$=5$x$1017$cm$-3,$

Dn$=25$ cm$2$

$/$s D

n$=5$x$10-7$ s

Nd$=5$x$1017$cm$-3$

D

P$=10$ cm$2$

$/$s

P$=5$x$10$

$-7$ s$.$

Let the photocurrent density be $20$ mA$/$cm$2$

$.$ Assume A$=1$cm$2$

$($a$)$ Calculate the maximum power delivered to the load assuming that the fill factor is $0\mathrm{.}8.$

$($b$)$ By what factor will the output power increase from $($a$)$ if the solar intensity is

increase by a factor of $10$ due to light concentration. Comment on your results