Solar starting to take off

$4.1 billion in orders for thin-film solar:

On Wednesday, Nanosolar pulled back the curtain on its thin-film photovoltaic cell technology--which it claims is more efficient and less expensive than that of industry leader First Solar--and announced that it has secured $4.1 billion in orders for its solar panels ...

... Nanosolar, based in San Jose, Calif., has developed a solar cell made from copper indium gallium (di)selenide. The semiconducting materials and nanoparticles are contained within a proprietary ink that makes it possible to print flexible solar cells on rolls of cheap aluminum foil.