Scientists have found that tiny gold particles improve the efficiency of organic solar cells. In the global solar field, organic photovoltaic solar cells have a wide range of application potential, but they are still considered to be upstarts. These carbon batteries that use organic polymers or small molecules as semiconductor components are thinner and cheaper than traditional solar cells produced using inorganic silicon wafers, but they still lag behind in photoelectric conversion. Now, researchers from the University of California, Los Angeles and their colleagues from China and Japan have proved that incorporating gold nanoparticles into these organic photovoltaics, using the plasma effect to increase the absorption of sunlight, can significantly improve the photoelectric conversion rate of the battery. . In a recent article published in the ACS Nanojournal, team researchers showed how, in a tandem polymer solar energy, they sandwiched a layer of gold nanoparticles between two layers of light-absorbing subunit cells to absorb a wider range of solar spectrum . The team is led by Yang Yang, a professor of materials science and engineering in Samueli engineering and applied science research at the University of California, Los Angeles. They found that using groups of gold nanoparticle layers can increase the photoelectric conversion rate by up to 20%. Gold nanoparticles form a strong electromagnetic field through the plasma effect in a thin organic photovoltaic layer, and more light is absorbed by the sub-unit cells after the light is concentrated. The team reported for the first time that plasma-enhanced mode polymer tandem solar cells overcome the difficulty of incorporating metal nanostructures into the entire device structure. "We have successfully demonstrated high-efficiency plasma polymer tandem solar cells by merging gold nanoparticles into two sub-cells," Yang said. "The plasma effect occurs at the most effective point in the middle of the interlayer, which can simultaneously improve the absorption capacity of the sub-cells on the top and bottom layers, and increase the conversion rate of tandem solar cells from 5.22% to 6.24%. The improvement rate is as high as 20%. The research team The members also include staff from the Key Laboratory of Semiconductor Materials Science of the Institute of Semiconductors, Chinese Academy of Sciences and staff from the Yamagata University School of Science and Engineering. Experimental and theoretical results show that the increase in conversion rate comes from the enhancement of the magnetic field of light nanoparticles. The results show that in the future In the development of polymer solar cells, the plasma effect has great potential for development. The team recommends that the sandwich structure be used as an open platform for a variety of polymer materials to provide opportunities for the development of efficient, multi-stack tandem cells. Funded by the US Nano Research Office and the National Science Foundation. The research team also includes staff from the Department of Materials Science and Engineering at the University of California, Los Angeles and the California Institute of Nanotechnology.
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