a solar cell is made with n and p type silicon. does it have
to be the same thickness exactly of each or is there more of
one than another??

 

Beats me. Here's a reference that might have some useful information - http://thefraserdomain.typepad.com/energy/2005/09/overview_of_pho.html.

One guess is that holes are less mobile than electrons, so the p doping might have to be heavier than the n.

 

One guess is that holes are less mobile than electrons, so the p doping might have to be heavier than the n.

Hole mobility is approximately half that of electrons.

Dave