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Zanjān, Iran

Bakhshayesh A.M.,Royin Kar Shams Company | Farajisafiloo N.,Royin Kar Shams Company
Materials Science in Semiconductor Processing | Year: 2015

Uniform sponge-like films are deposited by a novel TiO2 gel, in which anatase phase was stabilized using zinc chloride, for dye-sensitized solar cells (DSCs) applications. The introduction of Zn into TiO2 lattice limits the transformation from anatase to rutile phase, stabilizing anatase nanoparticles. The films are composed of uniform spherical particles with diameter around 3 μm, containing small nanoparticles with the average grain size of 40 nm, deposited by a dip coating method. X-Ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) reveal that Zn2+ is well incorporated into the titania crystal lattice without forming specific zinc phases. UV-visible spectra show that the doped-TiO2 films have lower band gap energy than that of undoped-TiO2, extending the absorption of TiO2 into visible region. The DSC stabilized with 0.4 at% Zn (i.e., Z4) had the highest power conversion efficiency of 7.15% as a result of less recombination, which is demonstrated by electrochemical impedance spectroscopy (EIS). © 2014 Elsevier Ltd. All rights reserved. Source


Bakhshayesh A.M.,Royin Kar Shams Company | Farajisafiloo N.,Royin Kar Shams Company
Journal of Materials Science: Materials in Electronics | Year: 2015

In this study, we reported a facile straightforward process for the deposition of uniform photoanode electrodes by a novel TiO2 gel for dye-sensitized solar cells (DSSCs) applications. Highly crystalline anatase-TiO2 phase is stabilised by niobium chloride at 500 °C. The electrodes are composed of uniform spherical particles with diameter around 3 µm, containing small nanoparticles with the average grain size of 40 nm, deposited by dip coating method. X-ray photoelectron spectroscopy revealed that 0.7 at.% Nb5+ was incorporated into titania crystal lattice and stabilised anatase phase by limiting the transformation from anatase to rutile phase. UV–Visible spectra showed that the stabilised-film had lower band gap energy than that of undoped-TiO2, extending the absorption of TiO2 into visible region. The anatase-stabilised DSSC had higher power conversion efficiency of 7.09 % than that of unstabilised cell (6.21 %) as a result of less recombination, which is demonstrated by electrochemical impedance spectroscopy. © 2015, Springer Science+Business Media New York. Source


Bakhshayesh A.M.,Royin Kar Shams Company | Farajisafiloo N.,Royin Kar Shams Company
Applied Physics A: Materials Science and Processing | Year: 2015

A facile deposition of uniform photoanode electrodes by a novel anatase-stabilised gel for dye-sensitised solar cells (DSCs) applications is reported. Highly crystalline anatase–TiO2 phase is stabilised by indium nitrate at 500 °C. The electrodes are composed of uniform spherical particles with diameter around 3 µm, containing small nanoparticles with the average grain size of 40 nm, deposited by dip-coating method. X-ray photoelectron spectroscopy reveals that 6 at.% In3+ was incorporated into titania crystal lattice and stabilised anatase phase by limiting the transformation from anatase to rutile phase. UV–Visible spectra show that the stabilised film has lower band gap energy than that of undoped TiO2, extending the absorption of TiO2 into visible region. Electrochemical impedance spectroscopy demonstrates that the anatase-stabilised DSC enjoys less recombination and internal resistances, improving the photovoltaic performance of the cell. The anatase-stabilised DSC has higher power conversion efficiency of 7.48 % than that of unstabilised cell (6.37 %). © 2015, Springer-Verlag Berlin Heidelberg. Source


Bakhshayesh A.M.,Royin Kar Shams Company | Farajisafiloo N.,Royin Kar Shams Company
Applied Surface Science | Year: 2015

Abstract This paper reports a facile straightforward process for the deposition of uniform photoanode electrodes by a novel AlxTi1-xO2 gel for dye-sensitized solar cells (DSCs) applications. Highly crystalline anatase-TiO2 phase is stabilised by aluminium chloride at 500 C. The electrodes are composed of uniform spherical particles with diameter around 3 μm, containing small nanoparticles with the average grain size of 40 nm, deposited by dip coating method. X-ray photoelectron spectroscopy (XPS) reveals that 0.5 at.% Al3+ was incorporated into titania crystal lattice and stabilised anatase phase by limiting the transformation from anatase to rutile phase. UV-vis spectra show that the stabilised-film has lower band gap energy than that of undoped-TiO2, extending the absorption of TiO2 into visible region. Electrochemical impedance spectroscopy (EIS) demonstrates that the anatase-stabilised DSC enjoys less recombination and internal resistances, improving the photovoltaic performance of the cell. The anatase-stabilised DSC has higher power conversion efficiency of 7.52% than that of unstabilised cell (6.40%). © 2015 Elsevier B.V. All rights reserved. Source

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