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August 27, 2007 Cover, Vol. 85, Issue 35

August 27 2007 Cover, Vol. 85, Issue 35

Tapping The Sun

COVER: The electron micrograph shows an array of zinc oxide nanowires, an inexspensive semiconductor. These and other nanostructured inorganic materials are forming alternatives to crystalline silicon for use in photovoltaic cells. Courtesy of Peidong Yang, University of California, Berkeley.

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