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According to foreign media reports, researchers have found that in solar cells, a mixture of organic molecules can be used to absorb sunlight and convert it into electrical energy. In addition, this battery can also be applied to curved surfaces such as car bodies. This discovery challenges traditional beliefs and helps commercialize solar cells as soon as possible.
In a basic organic solar cell, an organic semiconductor film is sandwiched between two electrodes. The thin film extracts the electric charge generated in the organic semiconductor layer into an external circuit. For a long time, it has been believed that the electrode surface needs to be 100% conductive in order to extract the maximum charge.
Scientists at the University of Warwick in the United Kingdom have found that in organic solar cells, as long as 1% of the surface of the electrode surface is conductive, it will be fully effective. Therefore, at the interface between the electrode and the light-harvesting organic semiconductor layer, a series of composite materials can be used to improve device performance and reduce costs. Ross Hatton, chief researcher of the Department of Chemistry, said: "It is generally believed that to optimize the performance of organic solar cells, the interface between the electrode and the organic semiconductor needs to be maximized. We question this." In order to find the answer, the researchers An electrode model was developed to systematically transform the surface. It can be seen that even if 99% of the electrode surface is insulated, as long as the conductive area is not far away, it behaves as if the surface is 100% conductive.
In the high-performance organic solar cell, an additional transparent layer is provided at the interface between the electrode and the light-collecting organic semiconductor layer. These transparent layers are essential for optimizing the light distribution in the device and improving stability. Of course, the premise is that the charge must be conducted to the electrode. This is a difficult task because there are not many materials that can meet all the requirements at the same time. Postdoctoral researcher Dinesha Dabera explained: "From the new findings, it can be seen that insulators and conductive nanoparticle composites have great potential in this area, such as carbon nanotubes, graphene fragments or metal nanoparticles. These materials can help In order to improve equipment performance and reduce costs. At present, organic solar cells are very close but not fully commercialized. Therefore, if there are any technologies that can further reduce costs and improve performance, they will help achieve this goal. "
Organic solar cells do not contain toxic elements and can be processed by roll-to-roll deposition at low temperatures. Therefore, this battery is more environmentally friendly, not only has a very low carbon footprint, but also has a short energy recovery time. Hatton said: "What we have to do is to demonstrate the design method of solar cells, provide a wider range of material choices, and promote commercialization."
Hatton said: "At present, the demand for solar cells is growing rapidly. This kind of battery can be installed on a light-weight, color-adjustable flexible substrate. Traditional silicon solar cells are very suitable for large-scale solar farms and building roofs. Power generation. However, they are difficult to meet the needs of electric vehicles and difficult to integrate into the windows of buildings, and these are no longer niche applications. Organic solar cells can be installed on these curved surfaces, and they are very lightweight and do not account for . this finding space or to promote the development of new flexible solar cells, provides designers with more materials selected to achieve commercial application. "(author: Elisha)
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