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‘Spin-flip’ technique promises to shatter efficiency limits
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Researchers in Japan have developed a new material that allows solar cells to generate an amount of energy from sunlight that was previously thought impossible.
The discovery, made by a team at Kyushu University, involves a special “spin-flip” emitter that can harvest energy from the Sun that is typically lost as heat.
The breakthrough overcomes the long-standing limit of conventional solar cells to achieve an energy conversion efficiency of 130 per cent – opening up new possibilities for ultra-efficient solar panels.
With conventional solar cells, a single particle of light called a photon can generate one energy carrier, known as an exciton.
Until now, solar cell technology has only been able to harvest energy from about one-third of the available sunlight due to higher-energy photons, like blue light, being lost as heat.
The researchers used a process called singlet fission to split the excitons from the higher-energy photons into two lower-energy excitons – theoretically doubling the energy.
“We have two main strategies to break through this limit,” said Yoichi Sasaki, Associate Professor at Kyushu University’s Faculty of Engineering.
“One is to convert lower-energy infrared photons into higher energy visible photons. The other is to use singlet fission to generate two excitons from a single exciton photon.”
The research was published in the Journal of the American Chemical Society, in a study titled ‘Exploring spin-state selective harvesting pathways from singlet fission dimers to a near-infrared-enissive spin-flip emitter’.
The discovery is the latest in a string of recent breakthroughs with solar technology, making the renewable energy sector increasingly efficient and cost effective.
Earlier this month, a team in Switzerland set a new efficiency record for a new type of solar cell using the ‘miracle material’ perovskite.
By combining it with silicon, the researchers were able to achieve efficiency levels that rival satellite-grade solar panels at a fraction of the cost.
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