According to a report by the American Physicists Organization Network on February 10, researchers Yuri Akimov and Wei Chengmei of the A * STAR Research Institute for High-Performance Computers in Singapore found that the deposition of aluminum particles can improve thin films The photoelectric conversion efficiency of the solar cell. This metal nanoparticle can prevent the escape and reflection of light, so that more direct light can directly enter the solar cell. Akimov said that the 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 hardly play any role. But for thinner thin-film solar cells, nanoparticles play a big role. They increase the scattering of light after entering the solar cell, increase the time that light stays in the film, and make the photoelectric conversion efficiency of the thin-film solar cell It is comparable to traditional solar cells.
The researchers simulated a variety of different types and sizes of nanomaterials to determine their effect on the solar cell's light absorption efficiency, and decided to determine the final "candidate" from aluminum particles and silver particles. The performance in solar cells was compared.
Generally speaking, most people think that silver particles should be given priority. Because they have better resonance performance in the visible range of the spectrum, it is easier to concentrate light into solar cells. But the actual situation is not like this: Although silver particles have a stronger light-capturing ability, they will also absorb a considerable amount of light, which will affect the conversion efficiency of solar cells. And because the resonant waveband exceeds the sunlight spectrum, aluminum particles can avoid this. In addition, aluminum particles are easier to be oxidized and their performance is more stable even if the shape and size are different. And more importantly, its scattering properties are stronger than silver particles.
Akimov said: "We have found that nanoparticles made of aluminum alloy have stronger light trapping performance than other metal particles and are more suitable for thin-film solar cells. And we believe that this technology can help solar cells become more Lighter, thinner and more efficient, it has greater commercial value. "
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