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| Nanoshells - Tiny spheres capture light |
Researchers in the US have reported on a new way to increase the amount of light absorbed by thin-film solar-cell materials. The new technique relies on "whispering gallery" modes in which light becomes trapped inside tiny shells made of silicon. The result could lead to more efficient photovoltaics, claims the team.
Nanocrystalline silicon could be ideal for making photovoltaic devices because it is an excellent conductor of electricity and can withstand harsh sunlight without suffering any damage. However, there is a problem: silicon does not absorb light very efficiently. Layers of the material have to be built up to increase the amount of light absorbed – a process that is both time-consuming and expensive.
Now, Yi Cui and colleagues at Stanford University have shown that nanoshells made of silicon could offer a quicker and cheaper route to solar-cell fabrication.
Physicsworld: Nanoshells could boost photovoltaics
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