Synthesis and Characteristics of Tb-Doped Y2SiO5 Nanophosphors and Luminescent Layer for Enhanced Photovoltaic Cell Performance
Abstract:Nanophosphors based on green emitting terbium doped yttrium silicates with the general formula Y2SiO5:Tb3+ with a size of 30∼60 nm were synthesized by the hydrothermal method. The prepared nanophosphors were characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy and fluorescence spectroscopy. It was found that the nanophosphors crystallize in an X1-type monoclinic structure (P21/c) and absorb UV light from 220 to 300 nm which they then down-convert into visible-light (strong green emission at around 545 nm (5D4 → 7FJ)). As TiO2-based dye-sensitized solar cells exhibit their maximum incident photon to current efficiency at around 500∼600 nm, the wavelength-modulation characteristics of the nanophosphors can be efficient for dye-sensitized solar cell systems. Therefore, the Y2SiO5:Tb3+ nanophosphors were introduced into a TiO2-based dye-sensitized solar cell and their effects on the performance of the solar cell were investigated.
Document Type: Research Article
Publication date: October 1, 2011
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