21 février 2020

[Solar cells] – Solar cells using quantum dots

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Solar cells using quantum dots - Codex International

The development of next generation solar power technology that has potential to be used as a flexible ‘skin’ over hard surfaces has moved a step closer, thanks to a significant breakthrough at The University of Queensland (Nature Energy, « Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs1-xFAxPbI3 quantum dot solar cells with reduced phase segregation »).
UQ researchers set a world record for the conversion of solar energy to electricity via the use of tiny nanoparticles called quantum dots, which pass electrons between one another and generate electrical current when exposed to solar energy in a solar cell device.
The development represents a significant step towards making the technology commercially-viable and supporting global renewable energy targets.
Professor Lianzhou Wang, who led the breakthrough, said: « Conventional solar technologies use rigid, expensive materials. The new class of quantum dots the university has developed are flexible and printable.
« This opens up a huge range of potential applications, including the possibility to use it as a transparent skin to power cars, planes, homes and wearable technology. Eventually it could play a major part in meeting the United Nations’ goal to increase the share of renewable energy in the global energy mix. »
Professor Wang’s team set the world record for quantum dot solar cell efficiency by developing a unique surface engineering strategy. Overcoming previous challenges around the fact that the surface of quantum dots tend to be rough and unstable – making them less efficient at converting solar into electrical current.
« This new generation of quantum dots is compatible with more affordable and large-scale printable technologies, » said Professor Wang.
« The near 25 per cent improvement in efficiency we have achieved over the previous world record is important. It is effectively the difference between quantum dot solar cell technology being an exciting ‘prospect’ and being commercially viable.’
UQ Vice-Chancellor and President Professor Peter Høj AC extended his congratulations to the UQ team.
« The world needs to rapidly reduce carbon emissions and this requires us to invest much more in research to improve existing energy-generation technologies and develop entirely new ones, » he said.
« Harnessing the power of fundamental technological and scientific research is a big part of this process – and that’s what we’re focused on at UQ ».
Source: University of Queensland

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