i think the first website ji inn provided us with is very useful - for the physics principal theory part cause it explains what it is made of, how light energy is converted bla blah.
oh and i came across this article in Newsweek and they mentioned now adays more and more ppl are getting environment friendly, partially due to the fact that they want to save more money in the long run. For eg, when u install the solar panels they might be more expensive, but in the long run, it ll save more money cause u dont have to pay so much electrical bills. so does it show that renewable energy is getting more popular? o.0

i think now we have quite a lot of info alr. like what is solar? how is solar panels made and how they work. So here is a website where it like summarizes the benifits of solar energy.

http://www.self.org/shs_benefits.asp