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In Ultrathin Layers, NREL Researchers Find a Path to Better Materials

Unexpected crystalline structure explains mechanism of long-used solar cell treatment and hints that further materials discoveries await.

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By: DAVID SAVASTANO

Contributing Editor, Coatings World and Ink World, Coatings World and Ink World Magazine

For more than three decades, photovoltaic researchers have known that the addition of a single chemical—cadmium chloride—creates better-performing cadmium telluride (CdTe) solar cells. But they have not understood exactly why—until now. The answer has implications for materials science that stretch well beyond solar cells. The light-absorbing layers in CdTe solar cells are composed of a thin film of material, about 10–100 times thinner than a human hair. Lots of modern devices, from solar cel...

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