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Scientists produce transparent, light-harvesting material
Date:11/3/2010

LOS ALAMOS, New Mexico, NOVEMBER 3, 2010Scientists at the U.S. Department of Energy's Los Alamos National Laboratory and Brookhaven National Laboratory have fabricated transparent thin films capable of absorbing light and generating electric charge over a relatively large area. The material, described in the journal Chemistry of Materials, could be used in development of transparent solar panels.

"Potentially, with future refinement of this technology, windows in a home or office could generate solar power," said Hsing-Lin Wang, a co-corresponding author of the paper and a researcher in the Chemistry Division at Los Alamos.

The new material is a semiconducting polymer spiked with "fullerenes"soccer-ball-shaped, cage-like molecules composed of 60 carbon atoms. When applied to a surface under carefully controlled conditions, the material self-assembles in a repeating pattern of micron-sized hexagonal-shaped cells resembling a honeycomb. Researchers created reproducible films of up to several square millimeters in area.

The material is largely transparent because the polymer chains pack together at the edges of the hexagons, remaining loosely packed and relatively thin across the centers. The densely packed edges strongly absorb light and could facilitate electrical conductivity, according to the researchers.

"Though such honeycomb-patterned thin films have previously been made using conventional polymers like polystyrene, this is the first report of such a material that blends semiconductors and fullerenes to absorb light and efficiently generate charge and charge separation," said lead scientist Mircea Cotlet, a physical chemist at Brookhaven's Center for Functional Nanomaterials (CFN).

Perfecting large-scale application of the material could enable a wide range of practical applications, such as energy-generating solar windows, or new types of optical displays.

The researchers fabricated the thin fil
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Contact: James E. Rickman
jamesr@lanl.gov
505-665-9203
DOE/Los Alamos National Laboratory
Source:Eurekalert

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