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A shadow-effect generator can produce a small electrical output when part of its surface is shaded: the contrast between illuminated and dark areas drives electrons through an external circuit. The 2020 device described by Chemistry World was a research prototype, not a practical way to charge a phone or power household appliances.
How can a device generate electricity from a shadow?
The reported shadow-effect generator (SEG) used a thin gold film deposited on a silicon wafer. The researchers arranged multiple cells on a flexible, transparent polyethylene terephthalate film. As team member Swee Ching Tan explained to Chemistry World, “only needs a piece of silicon substrate coated with a thin piece of [gold] metal.”
The device does not extract energy from darkness itself. Instead, it uses the difference between illuminated and shaded areas. According to the researchers’ explanation, illumination changes the work-function contrast across the metal film on silicon. Light generates electrons in the silicon, and electrons can flow from the illuminated region toward the dark region. When that flow passes through an external circuit, it can deliver electrical power.
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How much power did the prototype produce?
In the 2020 report, National University of Singapore researchers’ device produced 0.14 μW/cm² with 50% of the device in shadow, under indoor illumination described as 0.001 sun. Chemistry World said this was twice the output of a commercial silicon solar cell in that same stated indoor comparison.
That twofold comparison is narrow: it describes the devices under the reported low-light conditions, not a general advantage over commercial solar panels. University of Sydney photovoltaic expert Anita Ho-Baillie noted that standard commercial silicon cells are not designed to operate in shadows; they are designed to provide useful current for appliances and batteries. A result that compares favorably in a specific indoor test does not establish that the SEG can provide comparable practical power.
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Ho-Baillie characterized the reported 0.14 μW/cm² at 0.001 sun as 0.14% power-conversion efficiency. Tan also acknowledged that the current device’s efficiency was low. The reported output is therefore a research result at a specified illumination and shadow fraction, not evidence of appliance-scale performance.
Can shadow energy power a phone or other appliances?
The Chemistry World report does not describe a phone-charging demonstration, a commercial product, or field deployment. Tan mentioned phone charging as an aspirational possibility, while persistently shaded indoor locations and solar farms were suggested as areas of potential relevance. Those are proposed applications, not proven uses.
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The distinction matters because a measured power density in a laboratory condition does not, by itself, show that a device can supply the total power or sustained output a real appliance needs. The 2020 report provides no demonstrated phone-charging result or field-performance data for the SEG. It should be understood as a novel energy-harvesting concept rather than a consumer power source.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is known about the research?
Chemistry World’s 2020 research news report attributes the work to Q. Zhang and colleagues in Energy & Environmental Science (DOI: 10.1039/d0ee00825g). The experimental figure and mechanism described here are those reported in that account; the underlying paper has not been separately assessed here. The available report establishes a laboratory concept and its stated low-light result, but does not establish subsequent commercialization or real-world deployment.
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