http://cleantechnica.com/2013/02/25/graphene-breakthrough-one-photon-c
GRAPHENE discovery made by researchers at the Institute of Photonic Science (ICFO), in collaboration with Massachusetts Institute of Technology, Max Planck Institute for Polymer Research, and Graphenea S.L. Donostia-San Sebastian - demonstrates it is able to convert a single photon that it absorbs into multiple electrons that could drive electric current.
'Most materials, absorb one photon that generates one electron, but in the case of Graphene, we have seen that one absorbed photon is able to produce many excited electrons, and therefore generate larger electrical signals’ said Frank Koppens.
This feature makes non-toxic graphene an ideal building block for any device that relies on converting light into electricity.
In particular, it enables efficient light detectors and potentially solar cells that can harvest light energy from the full solar spectrum with lower loss.
The experiment, published in Nature Physics,consisted of sending a known number of photons with different energies onto a monolayer of graphene.
It was known that graphene is able to absorb a very large spectrum of light colors.
However now we know that once the material has absorbed light, the energy conversion efficiency is very high.
Our next challenge will be to find ways of extracting the electrical current and enhance the absorption of graphene.
Then we will be able to design graphene devices that detect light more efficiently and could potentially even lead to more efficient solar cells,’ said Koppens in a statement.
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'Most materials, absorb one photon that generates one electron, but in the case of Graphene, we have seen that one absorbed photon is able to produce many excited electrons, and therefore generate larger electrical signals’ said Frank Koppens.
This feature makes non-toxic graphene an ideal building block for any device that relies on converting light into electricity.
In particular, it enables efficient light detectors and potentially solar cells that can harvest light energy from the full solar spectrum with lower loss.
The experiment, published in Nature Physics,consisted of sending a known number of photons with different energies onto a monolayer of graphene.
It was known that graphene is able to absorb a very large spectrum of light colors.
However now we know that once the material has absorbed light, the energy conversion efficiency is very high.
Our next challenge will be to find ways of extracting the electrical current and enhance the absorption of graphene.
Then we will be able to design graphene devices that detect light more efficiently and could potentially even lead to more efficient solar cells,’ said Koppens in a statement.
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