Enhancement of carrier mobility by electrospun nanofibers of Nb-doped TiO2 in dye sensitized solar cells

Horie, Yuji; Watanabe, T.; Deguchi, Makoto; Asakura, Daisuke; Nomiyama, Teruaki

doi:10.1016/j.electacta.2013.05.037

Cited by 25 publications

(12 citation statements)

References 31 publications

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“…Nevertheless, the enhancement of photocurrent with increasing t d might be attributed to the acceleration of carrier injection and the reduction of carrier recombination by the band bending near the contact between TNO-NFs and TiO 2 nanoparticles in the mesoporous layer, as was observed near the TNO buffer layer of DSCs. 19) Therefore, the rate-determining factor for the photocurrent is considered to be the rate of carrier injection from dye/TiO 2 nanoparticles and the leakage of carriers from the surface rather than the improved v D of NFs in this study.…”

Section: Time-transient Investigation Of Photoexcited Carriersmentioning

confidence: 99%

Coating effect of electrospun nanofibers of Nb-doped TiO₂ mixed in photoelectrode of dye sensitized solar cells

Horie¹,

Deguchi²,

Guo³

et al. 2014

Jpn. J. Appl. Phys.

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Electrospun nanofibers (NFs) of Nb doped TiO 2 (TNO) were added as a conductive agent to TiO 2 mesoporous layer in dye sensitized solar cells. In order to improve the mobility of carriers in NFs by reducing the barrier at grain boundaries among constituent nanoparticles in NFs, the surface of TNO-NFs was coated with a thin TNO layer by pulsed laser deposition with changing the deposition time t d . It was found that the inter-grain space was filled first at t d : 5 min, and the diffusion velocity v D of carriers was increased by more than 10 times. Since J sc showed an increase of >15% while v D and the electron lifetime τ e decreased at t d > 10 min, the carrier injection from dye/TiO 2 nanoparticles to TNO-NFs was considered to be promoted.

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Section: Time-transient Investigation Of Photoexcited Carriersmentioning

confidence: 99%

Coating effect of electrospun nanofibers of Nb-doped TiO₂ mixed in photoelectrode of dye sensitized solar cells

Horie¹,

Deguchi²,

Guo³

et al. 2014

Jpn. J. Appl. Phys.

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“…Recently, we reported a synthesis of TiO 2 nanoparticles which can be effectively applied to DSSC photoelectrode by wet coating [5,6]. By doping Nb or W within TiO 2 lattices, it is reported that the optical and electronic properties can be further improved while preserving the original crystalline structure owing to similar ionic sizes of Nb and Ti [7][8][9][10][11][12]. The subsequent increase in electron-transport ability elevates current density, finally improving the efficiency of solar cell.…”

Section: Introductionmentioning

confidence: 97%

Inverse opal photoelectrode of Nb-doped TiO2 nanoparticles for dye-sensitized solar cell

et al. 2016

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In this study, Nb-doped TiO 2 nanoparticles were prepared by solution synthesis, and utilized as photoelectrode for dye-sensitized solar cell aiming to obtain better photon-to-current conversion efficiency. Nb doping was carried out using two different Nb precursors, and subsequent hydrothermal treatment resulted in the size-controlled (*10 nm) Nb-doped TiO 2 nanoparticles with typical ellipsoidal shapes and anatase morphologies. It was observed that NbCl 2 precursor resulted in more uniform particle size, while Nb oxalate resulted in relatively broader particle size distributions and higher aspect ratio ellipsoid. Using these nanoparticles, 10 lm-thick porous inverse opal (IO) photoelectrodes were fabricated by coating the mixed aqueous dispersions of Nb-TiO 2 nanoparticles and polystyrene particles of 270 nm diameter on conductive glass followed by thermal sintering. DSSC single cell performance tests revealed that a photoelectrode from 2 mol% Nb-TiO 2 obtained from NbCl 2 exhibited 20 % enhancement for solar cell efficiency compared to bare TiO 2 IO.Electronic supplementary material The online version of this article (

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“…[2] To achieve aD SC with ah igh power conversion efficiency (PCE), the charge transfer rate is enhanced to obtaing reater charge collection prior to the recombination process.T his can be achieved by the design of three-dimensional (3D) TiO 2 -based photoanodes to increase the surface area for dye adsorption, which results in high current density.H owever, these electrodes show high charge recombination due to random traps and paths for electrons,p articularly at grain boundaries, which limits cell efficiency. [3,4] Ap ossible solutiont oo vercome this problem is the incorporation of one-dimensional (1D) TiO 2 structures,s ucha sn anofibers, [5,6] nanowires, [7] nanotubes, [8,9] or nanorods, [10] which results in reductions in electron-hole pair recombination by formingd irect paths for electron transfer. 1D structures are not only able to improve charge transport of DSCs,t hey also show light-scattering effects within the electrode,w hich enhances light harvesting and, therefore,i mproves the current density and thus the PCE.…”

Section: Introductionmentioning

confidence: 99%

Titania Nanotubes Decorated with Zn‐Doped Titania Nanoparticles as the Photoanode Electrode of Dye‐Sensitized Solar Cells

et al. 2017

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We decorated Zn‐doped TiO2‐nanoparticle‐based photoanodes with carbon nanotube (CNT)‐derived TiO2 nanotubes (TNs) to enhance the power conversion efficiency of dye‐sensitized solar cells (DSCs). X‐ray photoelectron spectroscopy analysis verified that Zn ions, in the range of 0 to 1 at %, were successfully doped into the TiO2 lattice. Field‐emission SEM and TEM images of the TNs, as derived from the sol–gel template‐assisted route, revealed that a uniform TiO2 coating with a thickness of 60 to 120 nm was deposited on the surface of the CNT template through a noncovalent route. We observed that the cell efficiency improved from 6.80 for pure TiO2 to 7.52 for 0.75 at % Zn‐doped TiO2 nanoparticles due to a reduction in charge recombination and enhancement in electron injection, as confirmed by using photoluminescence spectroscopy. Further improvements in the efficiency of up to 8.47 % were achieved by the incorporation of 5 wt % TNs into the Zn‐doped TiO2 photoanodes, as a result of enhancements in electron transport and light scattering, which was verified by using diffuse reflectance spectroscopy.

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Enhancement of carrier mobility by electrospun nanofibers of Nb-doped TiO2 in dye sensitized solar cells

Cited by 25 publications

References 31 publications

Coating effect of electrospun nanofibers of Nb-doped TiO₂ mixed in photoelectrode of dye sensitized solar cells

Coating effect of electrospun nanofibers of Nb-doped TiO₂ mixed in photoelectrode of dye sensitized solar cells

Inverse opal photoelectrode of Nb-doped TiO2 nanoparticles for dye-sensitized solar cell

Titania Nanotubes Decorated with Zn‐Doped Titania Nanoparticles as the Photoanode Electrode of Dye‐Sensitized Solar Cells

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Enhancement of carrier mobility by electrospun nanofibers of Nb-doped TiO2 in dye sensitized solar cells

Cited by 25 publications

References 31 publications

Coating effect of electrospun nanofibers of Nb-doped TiO2 mixed in photoelectrode of dye sensitized solar cells

Coating effect of electrospun nanofibers of Nb-doped TiO2 mixed in photoelectrode of dye sensitized solar cells

Inverse opal photoelectrode of Nb-doped TiO2 nanoparticles for dye-sensitized solar cell

Titania Nanotubes Decorated with Zn‐Doped Titania Nanoparticles as the Photoanode Electrode of Dye‐Sensitized Solar Cells

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Coating effect of electrospun nanofibers of Nb-doped TiO₂ mixed in photoelectrode of dye sensitized solar cells

Coating effect of electrospun nanofibers of Nb-doped TiO₂ mixed in photoelectrode of dye sensitized solar cells