New Method That Can Revolutionize The Solar Energy Harvesting........

Solar cells offer the opportunity to harvest abundant, renewable energy. Although the highest energy light occurs in the ultraviolet and visible spectrum, most solar energy is in the infrared. There is a trade-off in harvesting this light, so that solar cells are efficient in the infrared but waste much of the energy available from the more energetic photons in the visible part of the spectrum.
                                                 Researchers a Cambridge and Mons have found that there can be a process in which the initial electronic excitation can split into a pair of half-energy excitation. This can happen in certain organic molecules when the quantum mechanical effect of electron spin sets the initial spin 'singlet' state to be double the energy of the alternative spin 'triplet' arrangement.

                                                             
                                                  A Study published in journal Natural Chemistry shows that this process of singlet fission of triplet pairs depends on interaction of molecules...When the material is very dilute, the distance between molecules is large and singlet fission does not occur. When the solution is concentrated, collisions between molecules become more frequent. The researchers find that the fission process happens as soon as just two of these molecules are in contact, and remarkably, that singlet fission is then completely efficient -- so that every photon produces two triplets.