Singapore scientists seek power from darkness through shadow energy

Singapore scientists seek power from darkness through shadow energy
Singapore scientists seek power from darkness through shadow energy

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Jeddah - Yasmine El Tohamy - SINGAPORE: Scientists in Singapore are hoping to perfect a new method of power generation driven largely by shadows that might one day help cities to power themselves.

The shadow-effect energy generator (SEG) has the potential to harness power as solar panels do but without needing open spaces with uninterrupted light.

To work effectively, the SEG being developed by the National University of Singapore requires both light and dark and, like solar panels, relies on light to shine on silicon to energise electrons.

But using panels that feature a thin layer of either gold, silver, platinum or tungsten, the difference in light intensity drives electrons from lit areas toward the shade, creating electricity in the shaded areas.

“Our shadow effect generator comes in handy. It can be placed in those areas to harvest obstructed light,” said research team leader Dr. Swee Ching Tan.

The research is still in its early stages yet Tan’s team is already thinking about the potential of establishing a company to make SEG available for home use.

The panels the team have been testing are about 6 sq cm in size and capable of producing just 0.25 volts, meaning about 20 are needed to power a light bulb.

The ideal environment for use would be cities, Tan said, with constantly shifting levels of light and shade throughout the day from clusters of tall buildings and the sun’s changing position in the sky.

“It’s not practical to place solar cells in such cities. So the device might come in handy in places like very densely populated cities, where skyscrapers are everywhere, where shadows are always persistent.”  

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