According to the report of the American Physicist Organization Network on February 10th, Yuri, a research scientist of the High-performance Computer Research Institute of Singapore A*STAR Research Institute. Akimov and Wei Chengmei have found that the deposition efficiency of thin film solar cells can be improved by depositing aluminum particles, which can prevent light from escaping and reflecting, allowing more direct light to enter the solar cells directly. . Akimov said that this technology can enable us to further reduce the production cost of solar cells and enhance the competitiveness of solar cells.
Due to the large thickness of conventional solar cells, most of the light is absorbed and the precipitated nanoparticles do not play any role. However, for thinner thin-film solar cells, nanoparticles play a large role, they increase the scattering of light after entering the solar cell, increase the residence time of light in the thin film, and make the photoelectric conversion efficiency of thin-film solar cells. Enough to compare with traditional solar cells.
The researchers simulated a variety of different types and sizes of nanomaterials to determine their effect on solar cell light absorption efficiency, and decided to determine the final "personality" from the aluminum particles and silver particles. For this reason, the researchers are also dedicated to both. The performance in solar cells was compared.
In general, most people think that silver particles should be given priority. Because they have better resonance performance in the visible light range in the spectrum, it is easier to concentrate light into the solar cell. However, the actual situation is not the case: Although silver particles have a stronger light-trapping capability, they themselves also absorb a considerable amount of light, which will affect the conversion efficiency of solar cells. Since the resonant band exceeds the solar spectrum, aluminum particles can avoid this. In addition, aluminum particles are more easily oxidized and their properties are relatively stable even if they differ in shape and size. And, more importantly, its scattering properties are stronger than silver particles.
Akimov said: “We have found that nanoparticles made of aluminum alloy have better light trapping properties than other metal particles and are more suitable for thin film solar cells. And we believe this technology can help make solar cells even more Lighter and more efficient, giving it greater business value."
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