Saturday, July 3, 2010

Splitting singlets to save the planet

A really nice talk at the I2CAM workshop on organic photovoltaics this week was the one given by Christopher Bardeen, Exciton Fission and Electronic Delocalisation in Organic Semiconductors.
Here, I will just explain some of the beautiful physics of how you can split a singlet exciton into two triplet excitons.
First, the group theory. The product of two triplet states can be written
Presumably, a similar identity holds for l=1 spherical harmonics.

How might this happen in a conjugated organic molecule?

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