Scientists at Kyushu University in Japan just shattered the theoretical ceiling that has defined solar cell physics for sixty years — achieving 130 percent energy conversion efficiency using a technique that turns one photon of sunlight into more than one unit of usable energy.

 

Scientists at Kyushu University in Japan just shattered the theoretical ceiling that has defined solar cell physics for sixty years — achieving 130 percent energy conversion efficiency using a technique that turns one photon of sunlight into more than one unit of usable energy. Researchers from Kyushu University, working with collaborators at Johannes Gutenberg University Mainz in Germany, developed a new approach using a molybdenum-based metal complex known as a spin-flip emitter to capture extra energy generated through a quantum process called singlet fission — a phenomenon long described by physicists as a dream technology for pushing past the conventional solar efficiency limit. In conventional solar cells, a single photon can only liberate a single electron to generate electricity regardless of how much energy it carries. Singlet fission splits the energy of one high-energy photon into two separate electron-generating events, extracting work from energy that standard silicon panels simply waste as heat.

The 130 percent figure describes quantum efficiency — the ratio of electron-generating events to absorbed photons — rather than the overall energy conversion efficiency of a complete solar module, which remains subject to additional thermodynamic constraints. But achieving greater than 100 percent quantum efficiency at all is the physical breakthrough the field has been working toward for years, because it proves that the fundamental mechanism for exceeding the conventional solar efficiency ceiling actually works in real materials rather than only in theoretical calculations.

What the Kyushu team built is the proof of concept. The engineering pathway from this laboratory demonstration to a commercial solar cell that captures this extra efficiency in a manufacturable, durable format remains a significant research challenge. But the impossible just became possible — and solar physics is not going back to where it was before this result.

Source: ScienceDaily / Kyushu University / Journal of the American Chemical Society, March 28, 2026

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