Recently, Canadian scientists have developed a new technology that can significantly improve the performance of solar cells. This technology can improve the solar energy conversion efficiency by 35% in the near-infrared spectrum and increase the overall conversion efficiency (full spectrum) by 11% Quantum dot photovoltaic is an excellent candidate to replace existing solar cell technologies. Related papers published in the latest issue of "nano Express."
Quantum dot photovoltaic cells provide low-cost, large-area solar power, but the device is inefficient at the infrared side of the solar spectrum, which accounts for half of the solar energy reaching the Earth. Teide & middot; Sargent and his team at the University of Toronto, Canada, proposed that plasma spectroscopy and solution-treated plasma nanoparticles provide unprecedented control over light transmission and absorption.
Colloidal quantum dots have two major advantages. The first is cheaper because they reduce the cost per watt of electricity, but the more important advantage is that simply changing the size of the quantum dots can change the absorption spectrum. The easy-to-change and tunable properties of plasma materials: By changing the size of the plasma particles, researchers can overlap the absorption and scattering spectra of these two important nanoparticles.
Sargent's team has increased the efficiency of solar cells by embedding gold nanoshells directly into QDs, and they will be looking for ways to achieve the same goal with cheaper metals. Paul Wismar, director of the Institute of Nanoscale Systems at the University of California, USA, believes the study's importance lies in showing the potential to improve solar cell efficiency by tuning nanoparticle properties.
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