Uniform nanostructured photoelectrodes made of a zinc-stabilized TiO2 gel for dye-sensitized solar cell applications

Bakhshayesh, A.M.; Farajisafiloo, N.

doi:10.1016/j.mssp.2014.12.042

Cited by 11 publications

(4 citation statements)

References 44 publications

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“…In a typical experiment, TiO 2 gels were prepared according to the method reported in our previous works [15][16][17]. At first, a TiO 2 sol was prepared using titanium (IV) isopropoxide (TTIP) with a normal purity of 97% (Merck, Germany) as a titanium precursor and nitric acid 70% (Merck, Germany) as a catalyst for the peptisation.…”

Section: Preparation Of Tio 2 Gelmentioning

confidence: 99%

Enhanced performance of dye-sensitized solar cells aided by Sr,Cr co-doped TiO 2 xerogel films made of uniform spheres

Bakhshayesh¹,

Bakhshayesh²

2015

Journal of Colloid and Interface Science

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Section: Preparation Of Tio 2 Gelmentioning

confidence: 99%

Enhanced performance of dye-sensitized solar cells aided by Sr,Cr co-doped TiO 2 xerogel films made of uniform spheres

Bakhshayesh¹,

Bakhshayesh²

2015

Journal of Colloid and Interface Science

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“…In our earlier research [15][16][17][18], a novel strategy for the deposition of uniform and porous TiO 2 photoanode was reported, so-called polymeric gel process. The prepared gel is composed of spherical particles with diameter around 2.5 lm, made of small nanoparticles with average grain size of 60 nm.…”

Section: Introductionmentioning

confidence: 99%

Multi-layered architecture of electrodes containing uniform TiO2 aggregates layers for improving the light scattering efficiency of dye-sensitized solar cells

Bakhshayesh¹,

Azadfar²,

Bakhshayesh³

2015

J Mater Sci: Mater Electron

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This study comes up with a new architecture of multi-layered photoanode electrodes containing two thick layers (i.e., 6 lm) of nanocrystalline TiO 2 particles and two thin layers (i.e., 1 lm) of uniform TiO 2 aggregates, which are alternately deposited. The aggregates layers are deposited by a straightforward gel process, developed for the preparation of uniform and sponge-like light scattering layer for dye-sensitized solar cells (DSSCs) applications. The aggregates layers are composed of uniform spherical particles with average diameter of 2 lm, containing small nanoparticles with the average grain size of 20 nm. The nanocrystalline layers contain 20-nm-diameter TiO 2 nanoparticles. X-ray diffraction reveals that the nanocrystalline layers have a pure anatase phase, whereas the aggregates layers show a mixture of anatase and rutile phases. Diffuse reflectance spectroscopy demonstrates that the multi-layered electrode enjoys better light scattering ability than that of mono-layered electrode due to the incorporation of a thin light scattering layer into the nanocrystalline film. The multi-layered DSSC shows the highest power conversion efficiency of 7.69 % as a result of higher light harvesting and less recombination which is demonstrated by electrochemical impedance spectroscopy. From IPCE measurement, the external quantum efficiency of the multi-layered cell is equal 88 %, which is higher than that of mono-layered cell (i.e., 78 %).

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“…Various attempts were made to rectify this by recreating the processing history of the films using sol-gel techniques, which enjoys excellent compositional control and high homogeneity. In our earlier work [15][16][17], a novel strategy for the deposition of uniform and sponge-like TiO 2 photoanode for DSC application was reported, so-called polymeric gel process. At first, a TiO 2 gel containing uniform spherical particles was prepared.…”

Section: Introductionmentioning

confidence: 99%

Improved short-circuit current density of dye-sensitized solar cells aided by Sr,Nb co-doped TiO2 spherical particles derived from sol–gel route

Bakhshayesh¹,

Bakhshayesh²

2015

J Sol-Gel Sci Technol

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This study comes up with a uniform electrode containing Sr,Nb co-doped TiO 2 particles for dye-sensitized solar cell applications. The spherical particles with the average diameter around 2.5 lm are composed of small nanoparticles with the average grain size of 60 nm. X-ray diffraction reveals that the introduction of dopants not only inhibits the growth of rutile phase, but also results in smaller primary crystallites, improving the surface area and dye adsorption ability of the electrodes. X-ray photoelectron spectroscopy shows Sr 2? and Nb 5? ions to be well incorporated into the titania crystal lattice without forming specific strontium or zinc compositions. UV-Visible spectra show that the co-doped TiO 2 films have lower band gap energy than the undoped-TiO 2 , extending the absorption of TiO 2 into visible region. Isolated energy levels in the band structure of TiO 2 as well as local lattice distortions due to dopants introduction are the parameters that enhance the short-circuit current density of the cells. The TiO 2 DSC co-doped with 0.075 at% Sr and 3 at% Nb (i.e., S7N3 cell) has the highest power conversion efficiency of 7.97 % as a result of less recombination, which is demonstrated by electrochemical impedance spectroscopy. Graphical Abstract

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Uniform nanostructured photoelectrodes made of a zinc-stabilized TiO2 gel for dye-sensitized solar cell applications

Cited by 11 publications

References 44 publications

Enhanced performance of dye-sensitized solar cells aided by Sr,Cr co-doped TiO 2 xerogel films made of uniform spheres

Enhanced performance of dye-sensitized solar cells aided by Sr,Cr co-doped TiO 2 xerogel films made of uniform spheres

Multi-layered architecture of electrodes containing uniform TiO2 aggregates layers for improving the light scattering efficiency of dye-sensitized solar cells

Improved short-circuit current density of dye-sensitized solar cells aided by Sr,Nb co-doped TiO2 spherical particles derived from sol–gel route

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