Abstract
Y1.86Eu0.14WO6 phosphors were prepared using a solid-state reaction method. Their optical properties were analysed, and they was mixed with TiO2, sintered, and used as a photoelectrode (PE) in dye-sensitized solar cells (DSSCs). The as-prepared photoelectrode was characterized by photoluminescence spectroscopy, diffuse reflectance, electrochemical impedance spectroscopy (EIS) and X-ray diffraction. The photoelectric conversion efficiency of the DSSC with TiO2:Y1.86Eu0.14WO6 (100:2.5) was 25.8% higher than that of a DSCC using pure TiO2 as PE. This high efficiency is due to the ability of the luminescent material to convert ultraviolet radiation from the sun to visible radiation, thus improving the solar light harvesting of the DSSC.
Highlights
Dye-sensitized solar cells (DSSCs) are part of this third generation, and they have attracted considerable attention because of their low cost, easy fabrication and relatively high conversion efficiencies [1,2]
We focused on the preparation of Eu3+-doped Y2W06 and its application in photoelectrodes (PE) in DSSCs in order to investigate the possibility of increasing the spectral response of DSSCS using down-shifting luminescent materials
D is the average grain size, λ is the wavelength of the radiation used in the diffraction experiments, θ is the diffraction angle and β is the full width at half maximum (FWHM) of the observed peak
Summary
Dye-sensitized solar cells (DSSCs) are part of this third generation, and they have attracted considerable attention because of their low cost, easy fabrication and relatively high conversion efficiencies [1,2]. To harvest energy in the red and NIR regions of the solar spectrum, new types of dyes, quantum dots and co-sensitizers are currently under development [5,6,7,8]. All of these routes still suffer from some disadvantages, such as: (i) the new dyes do not absorb at wavelengths above 750 nm, i.e. in the red region; (ii) organic dyes decompose relatively upon interacting with the I3− electrolyte; and (iii) quantum dots are sensitive to the presence of moisture or oxygen and have restrictions for their use in sensitized solar cells [9,10]. We focused on the preparation of Eu3+-doped Y2W06 and its application in photoelectrodes (PE) in DSSCs in order to investigate the possibility of increasing the spectral response of DSSCS using down-shifting luminescent materials
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