How to Make a Solar Panel

I'm imagining how much electricity could be saved if every household around the world could have a solar panel converting sunlight to electricity each day for free. Maybe the U.S. alone could save a billion or probably a trillion dollar each year. Considering a bullish price on oil in the world market, this is not a bad idea.

This should be developed more by researchers to make it affordable to the public and more efficient. What do you guys think?