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Elusive 'hot' electrons captured in ultra-thin solar cells
Date:12/11/2009

CHESTNUT HILL, MA (12/11/2009) Boston College researchers have observed the "hot electron" effect in a solar cell for the first time and successfully harvested the elusive charges using ultra-thin solar cells, opening a potential avenue to improved solar power efficiency, the authors report in the current online edition of Applied Physics Letters.

When light is captured in solar cells, it generates free electrons in a range of energy states. But in order to snare these charges, the electrons must reach the bottom of the conduction band. The problem has been that these highly energized "hot" electrons lose much of their energy to heat along the way.

Hot electrons have been observed in other devices, such as semiconductors. But their high kinetic energy can cause these electrons, also known as "hot carriers," to degrade a device. Researchers have long theorized about the benefits of harnessing hot electrons for solar power through so-called "3rd generation" devices.

By using ultrathin solar cells a film fewer than 30 nanometers thick the team developed a mechanism able to extract hot electrons in the moments before they cool effectively opening a new "escape hatch" through which they typically don't travel, said co-author Michael J. Naughton, the Evelyn J. and Robert A. Ferris Professor of Physics at Boston College.

The team's success centered on minimizing the environment within which the electrons are able to escape, said Professor of Physics Krzysztof Kempa, lead author of the paper.

Kempa compared the challenge to trying to heat a swimming pool with a pot of boiling water. Drop the pot into the center of the pool and there would be no change in temperature at the edge because the heat would dissipate en route. But drop the pot into a sink filled with cold water and the heat would likely raise the temperature in the smaller area.

"We have shrunk the size of the solar cell by making it thin," Kemp
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Contact: Ed Hayward
ed.hayward@bc.edu
617-552-4826
Boston College
Source:Eurekalert

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