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Scientists have managed to produce electricity from solar panels at a depth of 10 meters under the sea, opening up new possibilities for powering underwater devices.
The researchers tested the technology in the South China Sea, near the Weizhou Islands, where the panels managed to generate energy from sunlight even at depths where light is significantly weaker.
The secret lies in the use of perovskite, an alternative material to silicon, which can be tailored to absorb certain wavelengths of light. Although water absorbs and scatters most of the solar radiation, blue and green light can penetrate to greater depths.
In laboratory tests, the solar cells managed to convert about 35 percent of the light reaching them into electricity under simulated conditions 10 meters underwater.
Sea tests also showed measurable energy production. At a depth of two meters, a 115 square centimeter panel produced 1,416 milliwatt-hours over two hours. At 10 meters, the output was 324 milliwatt-hours in the same time.
The researchers also tested the durability of the cells in simulated underwater conditions. After 1,160 hours of testing, the panels showed almost no loss of performance. Based on these results, the team estimates that the technology could operate continuously for about five and a half years at a depth of 10 meters.
However, this figure is an estimate based on laboratory tests, and not the result of a real trial that lasted five and a half years at sea.
According to researchers, one of the most promising uses of this technology is to power ocean sensors, cameras, and communication devices that are located far from traditional power sources.
Currently, many of these devices rely on batteries and must be periodically pulled out of the water for maintenance or replacement. Underwater solar panels could help extend their operating time.
The researchers plan to test the technology at different depths in the next stages and determine how far below the sea surface solar energy can be effectively used.
If the results are confirmed in long-term tests in real marine conditions, this technology could create a new way to supply power to devices operating underwater./ CNA
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