The integration of nanotechnology has the potential to significantly enhance the efficiency of photovoltaic systems. A notable example is the "black battery" developed by researchers at Aalto University in Finland, which combines atomic layer deposition (ALD) with nanotechnology. By using plasma etching, they create nanostructures that drastically reduce light reflection across the entire spectrum. Additionally, ALD allows for the creation of an effective passivation layer, which helps minimize surface recombination of charge carriers.
Hele Savin, an assistant professor at Aalto University's Department of Micro and Nano Sciences, explained in a recent report: "Nano-structured black cells perform exceptionally well, reducing reflection over the full spectrum of light." She also highlighted that the surfaces created through ALD offer excellent passivation properties. According to her, the surface recombination rate in these black batteries is comparable to that of flat or pyramid-structured surfaces. This means both reflectance and passivation are effectively managed, with minimal differences in performance between black silicon and traditional silicon types when using polysilicon or single-crystal materials.
Despite the promising results, Savin acknowledges that applying this technology to commercial silicon-based batteries is still in its early stages. However, she remains optimistic about its potential to boost photoelectric conversion efficiency and enable large-scale, cost-effective solar cell production.
In parallel, her team is exploring other innovative projects, such as developing high-efficiency solar cells from low-purity silicon materials—an approach once thought unfeasible. "We've discovered methods to recycle waste silicon and use it in solar cells," she said. The current challenge lies in ensuring industrial control over the purity of these recycled materials and maintaining flexibility in the process. If successful, this could lead to a substantial reduction in the cost of solar panels.
When asked about the timeline for commercializing nanostructured black batteries, Savin expressed optimism. "We've already built a working prototype in the lab," she said. "The next step is to explore large-scale manufacturing and conduct outdoor testing on modules." She added, "From a theoretical standpoint, there are no major obstacles to commercialization. However, the cost of producing nanostructures will be a key factor."
Another consideration is that while nanostructures help reduce reflections, conventional anti-reflective coatings are often used alongside them. This can offset some of the cost savings associated with the nanostructure fabrication process.
A remaining challenge involves the use of sulfur hexafluoride (SF₆), a gas currently employed in the nanostructure formation process. SF₆ is a potent greenhouse gas and is regulated due to its environmental impact. Savin’s team is actively researching alternative technologies to eliminate the need for this gas, aiming to make the process more environmentally friendly without compromising performance.
Screw Pile Machine
As for the Ground Screw installation machines, we have mainly two types - Electric Screw Driver and screw pile machine.
Screw pile machine is a new type of simple drilling equipment with independent innovation, ideal for pile construction in solar panels, billboards, street lamp, fences, flagpoles, traffic signs, isolation net and simple houses, giving strong stratum adaptability and high efficiency.
The rig is equipped with a large torque rotary head for strong power, which provides strong adaptability in stratum.
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