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• W2896880959 abstract "In order to enhance the efficiency of photovoltaic solar cells and overcome their limitations, a matching between solar spectrum and semiconductor band gap is needed using luminescent materials. The following work present in this paper is mainly based on the adjustment of the solar spectrum to the cell bandgap by developing downconverting materials. Down conversion process is exploited to modify the solar spectrum due to a cooperative energy transfer between Tb <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3+</sup> and two Yb <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3+</sup> rare earth ions in silica-hafnia waveguides. Tb <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3+</sup> /Yb <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3+</sup> -codoped SiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> -HfO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> planar waveguides have been prepared by sol gel route, using a dip-coating deposition on SiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> substrates. The waveguides were obtained with different concentrations and the total amount was [Tb <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3+</sup> +Yb <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3+</sup> ] = 5%, 7%, 9%, keeping constant the molar ratio [Yb]/[Tb]=4. The comparison between the glass and the glass-ceramic structures demonstrated that the energy transfer is more efficient in glass ceramic since it combines the good optical properties of glasses with the optimal spectroscopic properties of crystals activated by luminescent species. A maximum quantum transfer efficiency of 154.6% was found for the highest rare earth doping concentration." @default.
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• W2896880959 date "2017-12-01" @default.
• W2896880959 modified "2023-09-23" @default.
• W2896880959 title "Rare Earth Ions Doped Down-conversion Materials for Third Generation Photovoltaic Solar Cells" @default.
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• W2896880959 doi "https://doi.org/10.1109/irsec.2017.8477416" @default.
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