1. Scientists discover new properties of light: Electrons similar to solid materials A group of scientists recently discovered a whole new way of interacting light with matter, a discovery that could advance technologies such as light-emitting diodes, high-efficiency solar power systems, and semiconductor lasers. American physicist Arthur Compton discovered in 1923 that gamma photons can interact strongly with free electrons or bound electrons to gain enough momentum, which confirmed that light can behave as both waves and particles. Recently, chemists at the University of California, Irvine in the United States, together with scientists at Kazan Federal University in Russia, discovered that photons can gain significant momentum when they are confined to nanoscale silicon space. They discuss the details of the study in their article "Photon-Momentum-Enabled Electronic Raman Scattering in Silicon Glass". Although silicon itself does not emit light, porous nanostructured silicon produces detectable light when irradiated with visible light. Over the years, while experts have become aware of this possibility, the exact source of the light has not been fully explained. The team discovered photon momentum in disordered silicon through electron Raman scattering. Unlike traditional vibratory Raman scattering, electron Raman scattering involves different initial and final states of electrons. This phenomenon was previously only observed in metals. Raman scattering, also known as Raman scattering, was discovered by Indian physicist Raman in 1928 and refers to the phenomenon in which the frequency of light waves changes after being scattered. 2. Hemispherical solar cells greatly improve the efficiency of light energy useIn the research and development of sustainable energy solutions, the development of more efficient solar cells is the key. Compared to traditional silicon-based cells, organic photovoltaic cells are an attractive option due to their flexibility and low production costs. Still, improving its performance is a challenge. A new study by Abdullah Gül University (AGU) in Turkey has dramatically improved the efficiency of light absorption and angular coverage by redesigning the structure of organic photovoltaic cells in the form of hemispherical shells. According to the Journal of Photonics for Energy, this innovative configuration, designed to maximize light absorption and angular coverage, is expected to redefine the future of renewable energy technology. Using three-dimensional finite element analysis (FEA) technology, the research team meticulously probed the absorption spectrum in the active layer of the hemispherical shell, accurately simulating the interaction between light and cellular structures and materials. Finite element analysis is an effective means of solving complex engineering problems, allowing for simulation analysis of the behavior of the structure under various conditions, such as different wavelengths of light and angles of incidence, by subdividing the structure into small, manageable units. This innovative finite element analysis shows that the hemispherical shell structure absorbs 66% more light than the planar structure when irradiated with transverse electrical (TE)-polarized light. In transverse magnetic polarization, light absorption is also significantly increased by 36%. In addition to superior absorption efficiency, the hemispherical shell structure provides wide angular coverage, with TE polarization angles up to 81 degrees and TM polarization angles up to 82 degrees. The adaptability of this design is particularly well suited for applications that require flexible light capture, such as wearable electronics.
Source | NetEase Technology Channel
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