Researchers from The University of Osaka uncover a mechanism that dramatically improves energy conversion for next-generation solar technologies

Osaka, Japan – Solar panels have become more efficient over the years, but even the best designs still lose a large fraction of the energy they absorb. Scientists around the world have been searching for ways to capture more energy from every ray of sunlight and unlock the true potential of solar technology.

In a study published in Nature Photonics, researchers from The University of Osaka and collaborating institutions identified a new mechanism that could help us do exactly that. The study shows how specially designed combinations of molecules and quantum dots can be used to dramatically increase solar cell efficiency beyond currently known limits.

Singlet exciton fission is a photophysical phenomenon in which one particle of light creates two excited energy states instead of one. In theory, this allows solar cells to generate more electricity from the same amount of sunlight. However, the most effective photophysical processes require extra energy, and are usually inefficient and difficult to control.

“We are interested in ways to increase the viability of singlet fission,” says senior author Masanori Sakamoto. “Our idea is to leverage interactions between molecules and quantum dots to create an intermediate state that helps the process proceed smoothly.”

Quantum dots are nanoscale semiconductors with unique optical and electronic properties that can be tuned for different applications. By using ultrafast laser measurements and theoretical calculations, the researchers found that tetracene molecules and quantum dots formed special hybridized electronic states at their interface.

“The hybridized states help energy move more efficiently through the system,” explains lead author Jie Zhang. “Instead of losing energy during the difficult endothermic process, the system uses the intermediate state to split one excited state into two with remarkably high efficiency.”

The researchers found that in particular, cadmium telluride quantum dots produced especially strong effects, achieving efficiencies close to the theoretical maximum. Their results also revealed that the improvement was caused not only by the arrangement of the molecules but also by the electronic interactions between the molecules and the quantum dots themselves.

“This mechanism opens up many new and exciting strategies for harvesting solar energy,” remarks Sakamoto. “Single exciton fission could guide the design of future high-efficiency light–energy conversion materials, especially solar panels.”

Future research will explore whether the same strategy can be applied to other molecule–quantum dot combinations, potentially leading to a broader range of highly efficient materials. Thanks to the work completed by the team, the future of solar technology certainly looks bright.
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The article, “Molecular quantum-dot orbital hybridization supports efficient endothermic singlet exciton fission,” was published in Nature Photonics at DOI: https://doi.org/10.1038/s41566-026-01908-0

About The University of Osaka
The University of Osaka was founded in 1931 as one of the seven imperial universities of Japan and is now one of Japan's leading comprehensive universities with a broad disciplinary spectrum. This strength is coupled with a singular drive for innovation that extends throughout the scientific process, from fundamental research to the creation of applied technology with positive economic impacts. Its commitment to innovation has been recognized in Japan and around the world. Now, The University of Osaka is leveraging its role as a Designated National University Corporation selected by the Ministry of Education, Culture, Sports, Science and Technology to contribute to innovation for human welfare, sustainable development of society, and social transformation.
Website: https://resou.osaka-u.ac.jp/en