A very important discovery has been made by the researchers at the ARC Centre of Excellence in Exciton Science which may have remarkable significance for the material design of solar cells. This team which was led by Professor Timothy Schmidt, had been looking for ways to capture the energy of visible light which at present is only accessed 25% of the solar spectrum and the rest is wasted on account of the limitations of silicon, as silicon can only make use of half the energy of green light.
An important way for reduction of waste is to design materials which can be coated on top of silicone so that the energy which otherwise was not captured, is now possible to be captured by incorporating singlet exciton fission. This method is expected to boost solar cell efficiency by 30%. As different ways and means are being thought of in order to reduce the cost of harvesting solar energy, one must consider designing materials which avoid excimer formation, as per Professor Timothy.
Singlet exciton fission has immense potential for enhancing the efficiency of solar cells. However. the dynamics are complex and it is still not well understood. These researchers have compared the fission process when it is run forwards and backwards in order to test the theory for the mechanism of exciton fission. The result showed that the intermediate fission process was in fact a source of loss. Thus, Professor Timothy directed the search of materials towards one which can enable better solar cell efficiency.