Scientists in Singapore are hoping to perfect a new method of power generation driven largely by shadows, with the hope that it could one day help highly urbanized cities power themselves.
The shadow-effect energy generator (SEG) being developed by the National University of Singapore has the potential to harness power like solar cells, but without needing open spaces with uninterrupted light.
To work effectively, the SEG requires both light and dark and, like solar panels, relies on light to shine on silicon to energize electrons.
However, 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,” research team leader Swee Ching Tan said.
The research is still in its early stages, but Tan’s team is thinking about the potential of establishing a company to make SEG available for home use.
The panels that the team have been testing are about 6cm2 in size and capable of producing just 0.25 volts, meaning that about 20 are needed to power a light bulb or charge a cellphone.
The ideal environment for use would be cities, 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, Tan said.
“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,” Tan added.
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