Canadian scientists have developed a new technology that can significantly improve the efficiency of solar cells, which can increase solar energy conversion efficiency by 35% in the near-infrared region, and increase overall conversion efficiency (full spectrum) by 11%, thereby enabling Quantum Dot Photovoltaics Become an excellent candidate to replace existing solar cell technology. The related papers were published in the latest issue of Nano Letters.

Quantum dot photovoltaic cells can provide low-cost, large-area solar power, but the device is inefficient in the infrared portion of the solar spectrum, and the infrared segment accounts for half of the solar energy reaching the earth. Ted Sargent, a professor of engineering at the University of Toronto in Canada, and his research team proposed that spectral tuning and solution processing of plasma nanoparticles can provide unprecedented control over the propagation and absorption of light.

Colloidal quantum dots have two major advantages. The first is cheaper because they reduce the cost per watt of electricity generated, but the more important advantage is that the absorption spectrum can be changed by simply changing the size of the quantum dots. The size is easy to change and tunable is the property of the plasma material: By changing the size of the plasma particles, researchers can superimpose the absorption and scattering spectra of these two important nanoparticles.

Sargent’s team has improved the efficiency of solar cells by embedding gold nanoshells directly in quantum dot absorber films. They will next seek to use cheaper metals to achieve the same goals. Paul Weiss, director of the Institute of Nanosystems at the University of California, USA, believes that the importance of this research lies in demonstrating the potential for improving the efficiency of solar cells by adjusting the characteristics of nanoparticles.

Drill bit

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