11/11/2023
Longi solar achieve 33% efficiency ( Miracle)
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China’s ‘miracle material’ achieves record-breaking solar panel energy
LONGi has crossed the theoretical limit of 33.7 percent efficiency for single junction solar cells with its tandem solar cell design.
Ameya Paleja
Ameya Paleja
Published: Nov 09, 2023 08:37 AM EST
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Artist's illustration of silicon-perovskite tandem solar cells
Artist's illustration of silicon-perovskite tandem solar cells
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Solar technology firm LONGi has set a new world record for silicon-perovskite tandem solar cells by reaching 33.9 percent efficiency. The achievement has been certified by the US National Renewable Energy Laboratory (NREL), a company press release has claimed.
Renewable energy research has seen a significant push with the world looking to reduce its dependence on fossil fuels. Scientists worldwide have been working to improve the efficiency of solar panels so that more energy can be generated from the same area where they are installed.
The standard single-junction solar cells found in all commercial installations have a theoretical limit of 33.7 percent, also referred to as the Shockley-Quieser (S-Q) limit. To overcome this, researchers have been working with different materials that can be paired with silicon to improve efficiency. Significant success has been achieved with perovskites.
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What is a perovskite-silicon tandem solar cell?
A tandem solar cell is made up of different materials, each responding to a separate section of the solar spectrum. This aids in improving the overall efficiency of the solar cell. With perovskites - a naturally occurring mineral of calcium, silicon-based solar cells have a theoretical efficiency of 43 percent, making them the likely candidate for upgrading conventional solar cells. This is why perovskites are also known as "miracle material".
Earlier this year, researchers at the King Abdullah University of Science & Technology (KAUST) in Saudi Arabia set a global record by reaching an efficiency of 33.2 percent with their tandem solar cell. At 33.9 percent, the effort from the Chinese firm might be marginally better but demonstrates much scope for improving the efficiencies of tandem solar cells.
More than a record for the Chinese
LONGi's achievement is significant considering that in November last year, its tandem solar cells had achieved 26.81 percent efficiency. This was a record in itself back then, but rapid developments in the field meant it was eclipsed many times over the following months.
China’s ‘miracle material’ achieves record-breaking solar panel energyStock image of a solar panel production facility
kynny/iStock
LONGi's arrival on top in the tandem solar cell research and development arena signals a shift of technological know-how to China, a trend we have seen in other domains. Earlier in the year, the Independent reported that the work done at Nanjing University in China would finally solve the problems of mass production of perovskites.
As a major global supplier of single-junction solar cells, LONGi is well-placed to leverage its production capabilities to roll out its highly efficient tandem solar cells, made with "miracle material". This is when UK-based Oxford PV is looking to produce its tandem solar cells at a German facility but has only clocked 28.6 percent efficiency.
With the photovoltaic industry keen on reducing costs and improving efficiencies to become the preferred option over fossil fuels, perovskite-silicon tandem solar cells have become a critical component for achieving this reality.
Other research on tandem solar cells has focused on improving their versatility and longevity. In addition to making double-sided solar panels, scientists have also worked on making them self-healing to be used for hundreds of years.
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