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Solar cell material can recycle light to boost efficiency
http://www.joh.cam.ac.uk/solar-cell-material-can-recycle-light-boost-efficiency[font face=Serif][font size=5]Solar cell material can recycle light to boost efficiency[/font]
Published on 24/03/2016
[font size=4]Researchers in the group of St John's Fellow, Professor Richard Friend, have found that perovskite materials can recycle light particles – a finding which could lead to a new generation of affordable, high-performance solar cells.[/font]
[font size=3]Scientists have discovered that a highly promising group of materials known as hybrid lead halide perovskites can recycle light – a finding that they believe could lead to large gains in the efficiency of solar cells.
…
By showing that they can also be optimised to recycle light, the new study suggests that this could just be the beginning. Solar cells work by absorbing photons from the sun to create electrical charges, but the process also works in reverse, because when the electrical charges recombine, they can create a photon. The research shows that perovskite cells have the extra ability to re-absorb these regenerated photons – a process known as “photon recycling”. This creates a concentration effect inside the cell, as if a lens has been used to focus lots of light in a single spot.
…
The researchers now believe that perovskite solar cells, may be able to reach considerably higher efficiencies than they have to date. “The fact that we were able to show photon recycling happening in our own cell, which had not been optimised to produce energy, is extremely promising,” Richard Friend, a corresponding author, said. “If we can harness this it would lead to huge gains in terms of energy efficiency.”[/font][/font]
Published on 24/03/2016
[font size=4]Researchers in the group of St John's Fellow, Professor Richard Friend, have found that perovskite materials can recycle light particles – a finding which could lead to a new generation of affordable, high-performance solar cells.[/font]
[font size=3]Scientists have discovered that a highly promising group of materials known as hybrid lead halide perovskites can recycle light – a finding that they believe could lead to large gains in the efficiency of solar cells.
…
By showing that they can also be optimised to recycle light, the new study suggests that this could just be the beginning. Solar cells work by absorbing photons from the sun to create electrical charges, but the process also works in reverse, because when the electrical charges recombine, they can create a photon. The research shows that perovskite cells have the extra ability to re-absorb these regenerated photons – a process known as “photon recycling”. This creates a concentration effect inside the cell, as if a lens has been used to focus lots of light in a single spot.
…
The researchers now believe that perovskite solar cells, may be able to reach considerably higher efficiencies than they have to date. “The fact that we were able to show photon recycling happening in our own cell, which had not been optimised to produce energy, is extremely promising,” Richard Friend, a corresponding author, said. “If we can harness this it would lead to huge gains in terms of energy efficiency.”[/font][/font]
