A team of Chinese researchers has made a groundbreaking achievement by successfully operating solar cells at a depth of 10 meters underwater. This development could potentially enable the use of solar energy to power underwater sensors, cameras, and communication systems far from the shore. The researchers used solar cells made of a material called "perovskite," which were able to generate 324 milliwatt-hours of energy during a two-hour experiment in the South China Sea.
One of the major challenges in using solar cells underwater is the limited amount of sunlight that can penetrate the water. As depth increases, the intensity of sunlight decreases rapidly, and different wavelengths of light are absorbed by the water to varying degrees. The researchers developed a system with optical filters that mimic the type and intensity of light available at different depths underwater. They found that solar cells with a "wide bandgap" were most suitable for operation in these conditions.
The researchers tested the solar cells in a laboratory setting and found that they retained about 96% of their original efficiency after being stored for 300 days in a nitrogen-filled environment. They also conducted stability tests and found that the solar cells showed no significant degradation in performance after 1160 hours of testing under simulated conditions at a depth of 10 meters.
The researchers then took their experiment to the next level by deploying the solar cells in a natural setting. They integrated perovskite solar units with underwater robots and placed them at a depth of 10 meters near the Wiji Islands in the South China Sea. The results were surprising, with the large-area solar cells generating a significant amount of electricity within just two hours.
The successful operation of solar cells underwater could have significant implications for various applications, including marine environmental monitoring, aquaculture, and underwater communication systems. This technology could provide a local source of power for underwater devices, reducing the need for battery replacement or long cables from land.
According to the researchers, the study demonstrates the feasibility of transitioning from small laboratory cells to larger units, which could potentially lead to the widespread adoption of underwater solar energy harvesting. The researchers believe that this technology could enable continuous operation for up to 5.5 years, although further testing is needed to confirm this.
The development of underwater solar cells could also have significant economic and environmental benefits. By providing a reliable source of renewable energy, this technology could reduce the carbon footprint of underwater operations and support sustainable development in marine environments.
Key points
- Chinese researchers have successfully operated solar cells at a depth of 10 meters underwater, generating 324 milliwatt-hours of energy during a two-hour experiment.
- The researchers used solar cells made of "perovskite" material, which showed high efficiency and stability in underwater conditions.
- The successful operation of underwater solar cells could enable various applications, including marine environmental monitoring, aquaculture, and underwater communication systems.
