The efficient use of solar energy for electricity generation
The St Andrews research, led by Professor John Irvine, has demonstrated that the atomically precise nanoparticles known as nanoclusters or molecular nanoparticles are capable of cutting a high-energy photon into two lower-energy ones, which could benefit the development of the third-generation photovoltaics, the direct conversion of light into electricity at the atomic level.
The findings are published today (1 August 2017) in the scientific journal Nature Communications.
The efficiency of an ideal single junction solar cell is limited to 30 per cent to balance the light absorption and the energy of the excited electro-hole pairs. The cutting of a high-energy photon into two photons of nearly half energy could offer the prospect of exceeding the efficiency limit as it will increase the number of charge carriers and efficient use of high-energy light rays in the solar spectrum.
The generation of two low-energy photons from a high-energy one has been observed in quantum dots and lanthanide ions due to the confinement of excitons and the transport of charge carriers from neighbouring ones.
Read more at: https://phys.org/news/2017-08-molecular-nanoparticles-major-advancement-solar.html#jCp
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