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"Sunlight in one hour could power the world for a year, but we don't tap into it for either electricity or for making solar fuels," Detty said, explaining the importance of his work. "Plants use sunlight to make their own fuels. Humans don't. We use oil. So if we want to have energy independence, it will come from solar."

Solaroad is a road that also works as a solar panel. The combination of these two functions is special, and makes it possible within the space we still got to road use even solar energy to capture and converting it into electrical energy, which then can be used for street lighting, traffic systems, but also households.

The researchers envision energy-producing photoconversion systems similar to photovoltaic cells that generate hydrogen fuel, comparable to the way plants and other photosynthetic organisms convert light to energy.

Egbe has achieved an efficiency of four percent and is trying to find out how to improve the efficiency in general. Not only for his system, but also for other systems researchers are working on. "The efficiency of organic solar cells has already reached eight percent and commercial products are on the market," he said.

The device is made entirely of earth-abundant, inexpensive materials - mostly silicon, cobalt and nickel - and works in ordinary water.

"The breakthrough in this work is that we have demonstrated power density comparable to what you can get with tiny membranes, but with membranes that are a factor of a hundred or so larger, demonstrating that the technology is scalable,"

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