Thats a cool project OTP57, and a great cause. I looked at both the solar project, and the solar cells photo series, but didn't see the origin of the basic components. Do you buy those parts to start with in making the solar cells?
I was talking to a cousin not long ago, and he mentioned some solar cells could be purchased in bulk for like a $100 and then assembled into panels which could then be sold for 3-400 $ Maybe I should have asked more info