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Researchers make cells with near-perfect internal efficiency.
Technical advances jump-start electric cars, wind turbines, and solar power.
Metamaterials that convert lower-energy photons to usable wavelengths could offer solar cells an efficiency boost.
An inexpensive, polymer-based device breaks a record, reaching 10.6 percent efficiency.
In acquiring Innovalight, DuPont will expand its solar business and develop new ways to make solar cells.