The compound eyes of insects are composed of multiple "small eyes", ranging from hundreds to thousands. These small eyes give ants, flies and other insects an ultra-wide field of view and the ability to quickly detect movement. Recently, Saudi Arabian scientists have Get inspiration from nature, want to improve the solar panel's light-capturing ability, develop spherical solar energy that looks like a Disco color ball, and claim that the power generation effect is 101% more than the general 2D solar cell.
The team of King Abdullah University of Science and Technology (KAUST), University of Jeddah, University of California, and the University of California, Berkeley, hope to increase the surface area of ​​light absorption, and thus increase the power generation of solar panels. KAUST microsystems engineering postdoctor Nazek El-Atab said that through compound eyes, the field of vision of flies can reach 270 degrees, and sunflowers are widely known to grow towards the sun forever.
Therefore, the team used the interdigitated back electrode solar structure (IBC) to produce spherical solar cells. It can capture direct sunlight from time to time without installing a solar tracking system. Depending on the solar cell materials and environment, the power can be increased by 15%- 100%, according to the research of the team, the new type IBC structure monocrystalline silicon spherical solar energy conversion efficiency also reached 18.93%.
The team's indoor experimental tests pointed out that this structure has stronger heat dissipation performance. Compared with traditional flat solar panels, the temperature is about 10% lower, and because it is spherical, it is less likely to accumulate dust. As for the power generation effect, if it simulates a rooftop solar scenario, it only absorbs sunlight and roof diffused light, and the output power is increased by 60%. If the aluminum sheet is surrounded, the power generation capacity is 101% higher.
However, it is not easy to produce spherical solar modules. First, corrugation technique is used to print and etch 138 μm continuous dents on a single crystal solar panel with a conversion efficiency of 15% to improve the flexible characteristics of the battery and also control the loss. At 5.6%, the electrodes on the back of the IBC battery are connected to each other, and then encapsulated with a non-toxic organosilicon compound polydimethylsiloxane (PDMS).
The team believes that this technology can bring new engineering ideas to the solar industry, using technology to increase solar output, rather than using more costly materials and processes.
Liu Zhe, a postdoctoral fellow in solar engineering at the Massachusetts Institute of Technology, pointed out that although this spherical solar energy has no way to replace the common 2D solar panels, it still has a niche market, such as his colleagues who want to pay attention to the golf balls that may never return , Is looking for and studying solar cells that can be covered on the sphere, and LIU also believes that such flexible solar cells can also be installed on buildings, cars and even mobile devices.
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