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According to the report of the Physicist Organization Network on June 6 (Beijing time), for the silicon photovoltaic industry, to manufacture economically viable solar cells, it is necessary to reduce the current module's cost by one dollar per watt, and these costs are mostly from silicon materials. And often used expensive manufacturing process. A team of scientists at Stanford University in the United States has recently developed a hybrid solar cell that is covered with silicon nanocones and organic conductive polymers. It can not only reduce costs in these two aspects, but also demonstrate excellent performance. The research results were published in the latest issue of Nano Express.
According to researchers, the use of nanomaterials for hybrid solar cells has two benefits: increased light absorption and reduced use of the required amount of silicon material. Solar cell nanotexturing involves nanowires, nanomasks (dome), and other structures. Studies have found that the nanopyramidal structure provides an aspect ratio (height/diameter of the nanopyramid) that enhances the best shape of the light absorption because it can simultaneously act on the anti-reflection and long-wavelength light scattering of the short-wave light.
In previous designs using nanomaterials, the space between the structures was often too small to fill the polymer. In new solar cells, the shape of the nano-cone allows the polymer to be coated in open spaces, reducing the need for other materials. This nano-pyramid/polymer hybrid structure can be formed by using a simple low-temperature method, which also reduces the process cost.
After testing the new solar cell and making some improvements, the researchers found that the resulting device efficiency reached 11.1%, which is the highest value in hybrid silicon/organic solar cells. In addition, the density of the short-circuit current indicates that the maximum current produced by this solar cell is only slightly lower than the world record for monocrystalline silicon solar cells and is very close to the theoretical limit.
The researchers predict that due to the good performance and simpler production process of hybrid silicon nanopyramid polymer solar cells, it may be considered as an economically viable photovoltaic device one day. (Reporter Hualing)
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