According to a report from the Physicist Organization Network on January 29 (Beijing time), researchers at the University of California, Davis, confirmed through computer simulations that using a special "silicon BC8" structure, multiple electron holes can be generated based on a single photon. Yes, a significant increase in solar cell conversion efficiency. The relevant research report was published in the latest edition of the Physical Review Letters. Solar cells are based on the photoelectric effect. When a photon or light particle strikes a single silicon crystal, a negatively charged electron and a positively charged hole are generated, and the collection of these electron hole pairs can generate Current. As the co-author of the paper, Julia Gali of the school's chemistry department said that traditional solar cells can generate an electron-hole pair on a per-photon basis, so their theoretical maximum conversion efficiency is about 33%. The new approach can generate multiple electron-hole pairs based on a single photon, thereby effectively increasing the efficiency of solar cells. Researchers used the supercomputer of the Lawrence Berkeley National Laboratory to simulate the behavior of silicon BC8. This silicon structure was formed in a high pressure environment, but it was also stable under normal pressure. The simulation results show that silicon BC8 nanoparticles do generate multiple electron-hole pairs based on a single photon, even when it is exposed to visible light. Stephen Weiberman, the lead author and postdoctoral researcher of the study, said that this approach can increase the maximum conversion efficiency of solar cells to 42%, surpassing any existing solar cells, and is of great significance. "In fact, if we use parabolic reflectors to collect sunlight for new solar cells, we have reason to believe that its conversion efficiency may be as high as 70%," he added. Some unfortunately, by combining with traditional silicon nanoparticles, the current solar cell model can only work under the irradiation of ultraviolet rays, and can not work under visible light irradiation. Previously, scientists at Harvard and MIT published papers that when ordinary silicon solar cells are irradiated with laser light, the energy emitted by the laser may create a local high pressure to form silicon BC8 nanocrystals. Therefore, the application of laser or chemical pressure may transform existing solar cells into high-efficiency new type solar cells. Temporary Fence,Wrought Iron Gates ,Welded Wire Fence ,Woven Wire Fence Fence,Farm Fence Co., Ltd. , http://www.nbfarmfence.com
U.S. Simulation Confirms Increased Solar Cell Efficiency to 42%