Recently, a team of Wu Kaifeng, a research group of the Special Zone for Optoelectronic Materials Dynamics at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, first proposed the concept of "quantum tailored solar concentrator", and based on this concept, quantum tailoring was applied to fluorescent solar concentrators to prepare a new solar concentrator The efficiency of the light board prototype device is double that of traditional devices. Related results were published in the international nanotechnology authoritative journal "Nano Express".
Fluorescent solar concentrator is a relatively simple large-area solar energy capture device, consisting of luminophores coated or embedded in a transparent substrate. The luminophore emits photons after absorbing the solar photons hitting the board. Due to the difference between the refractive index of the substrate and the air, about 75% of the photons will generate a total reflection mode, which is then guided to the edge of the board to excite the sticking to the edge Solar Cells. If the concentrating efficiency is high enough, a fluorescent solar concentrator and a small number of solar cells at the edge can be functionally equivalent to a whole large area of ​​solar cells, which will greatly reduce the cost of photovoltaic production capacity. The traditional fluorescent solar concentrators are limited by the lower luminophore fluorescence efficiency and self-absorption loss, which results in the internal optical efficiency of the device is generally less than 60%.
Quantum clipping is a novel optical phenomenon. Materials based on this effect can absorb one high-energy photon and simultaneously release two low-energy photons, satisfying the basic physical laws of energy conservation. The research team creatively proposed a fluorescent solar concentrator based on the quantum clipping effect, which can theoretically double the fluorescence quantum efficiency and completely suppress self-absorption losses. Therefore, the internal optical efficiency of the solar concentrator can redefine a new theoretical limit-150%.
Based on this concept, the research team synthesized a rare-earth metal ytterbium-doped nanocrystalline material that exhibits typical quantum tailoring characteristics, and used such nanocrystals to prepare a prototype quantum-cut fluorescent solar concentrator panel, achieving about 120% Optical efficiency inside the device. The study first proposed the concept of "quantum tailored solar concentrator", which has broad application prospects in reducing photovoltaic costs and realizing smart buildings. (Reporter Su Dapeng)
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