A solar cell is made of two types of semiconductors ... An increasing number of everyday items are powered with the sun, including backpacks, watches, cars, and airplanes. Also, electricity-generating ...

The cell keeps generating electricity, even on cloudy days, until the sun goes down at night. To see solar power in action, check out This Solar House.

It's plausible that sun-facing solar cells could essentially self-heal at temperatures of 100°C (212°F) -- this warmth is enough to repair the bonds in the lab.