Pushing Plastic Solar Cells

Image: Powerful polymers: This illustration shows the different layers that make up a new plastic solar cell with nearly perfect internal efficiency. From bottom to top, the layers are glass, a transparent electrode, two polymer layers, a titanium oxide layer that redistributes light, and an aluminum electrode. Credit: Nature Photonics

From Technology Review:

Researchers make cells with near-perfect internal efficiency.

Plastic solar cells are lightweight, flexible, and, most important, cheap to make. But so far, these devices have been too inefficient to compete with silicon solar cells for most applications. Now researchers from a few institutions claim to have made polymer solar cells with record-breaking efficiencies. These cells still aren't good enough to compete with silicon, but polymer efficiencies have been increasing at a rate of about 1 percent a year. If they can keep this up, say researchers, plastic solar cells will be competing with silicon within a few years.

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