Super solar collectors?

I would expect more from an engineering site...

I have talked to quite a few people about this already for a few years now. The inherent problems with this stems from the concentration of heat (energy). It does more than let the solar cell output (not make) electricity. It also heats the poor cell up.
Now take the sun, it has a lot of energy coming off of it. If you concentrate it by 4 you have an oven able to broil food. Multiply it by 1000? Silicon might sublimate, not to mention the steel supports holding the cell. Not very condusive to harnessing it into electricity.
If you could keep it in a solid electrically outputting cell, it's lifespan which is usually 20-30 years drops to around 10 days. If it took 6 hours to replace it would drop it's efficiency by 2.5%.
That's not the worst drain on efficiency though. Hot metal is a much worse conducter than cold metal. The near liquid state would make any electrical current a mere trickle.

http://www.engineering.com/Videos/VideoPlayer/tabid/4627/VideoId/2140/A-Solar-Cell-1000-Times-More-Powerful.aspx