Al2O3-coated nanoporous TiO2 electrode for solid-state dye-sensitized solar cell

Zhang, Xintong; Sutanto, Irwan; Taguchi, Takayuki; Tokuhiro, Kenichi; Meng, Qingbo; Rao, Tata N.; Fujishima, Akira; Watanabe, Hiroko; Nakamori, Toshie; Uragami, Masayuki

doi:10.1016/j.solmat.2003.08.006

Cited by 92 publications

(39 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results are consistent with several reports of increased V OC and decreased J SC for Al 2 O 3 -coated nanocrystalline SnO 2 and TiO 2 electrodes, [35][36][37] but at odds with other studies that find enhanced V OC , J SC , and fill factor for TiO 2 films with solgel-type Al 2 O 3 overlayers. 29, 38 Authors of one of the latter papers established that alumina shells retard the recombination dynamics of nanocrystalline TiO 2 by passivating surface recombination centers and slowing the rate of interfacial charge transfer.…”

Section: Resultssupporting

confidence: 92%

ZnO−Al₂O₃ and ZnO−TiO₂ Core−Shell Nanowire Dye-Sensitized Solar Cells

et al. 2006

View full text Add to dashboard Cite

We describe the construction and performance of dye-sensitized solar cells (DSCs) based on arrays of ZnO nanowires coated with thin shells of amorphous Al 2 O 3 or anatase TiO 2 by atomic layer deposition. We find that alumina shells of all thicknesses act as insulating barriers that improve cell open-circuit voltage (V OC ) only at the expense of a larger decrease in short-circuit current density (J SC ). However, titania shells 10-25 nm in thickness cause a dramatic increase in V OC and fill factor with little current falloff, resulting in a substantial improvement in overall conversion efficiency, up to 2.25% under 100 mW cm -2 AM 1.5 simulated sunlight. The superior performance of the ZnO-TiO 2 core-shell nanowire cells is a result of a radial surface field within each nanowire that decreases the rate of recombination in these devices. In a related set of experiments, we have found that TiO 2 blocking layers deposited underneath the nanowire films yield cells with reduced efficiency, in contrast to the beneficial use of blocking layers in some TiO 2 nanoparticle cells. Raising the efficiency of our nanowire DSCs above 2.5% depends on achieving higher dye loadings through an increase in nanowire array surface area.

show abstract

Section: Resultssupporting

confidence: 92%

ZnO−Al₂O₃ and ZnO−TiO₂ Core−Shell Nanowire Dye-Sensitized Solar Cells

et al. 2006

View full text Add to dashboard Cite

show abstract

“…11 Previously, dip-coating methods were employed to coat tunneling layers onto the nanoporous TiO 2 electrode [12][13][14] (i.e., Al 2 O 3 , MgO, SiO 2 ); however, control of the film growth through this technique is problematic, and comparatively thick films are required to ensure complete coverage. Here, we address the importance of the inorganic/organic * To whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Surface Passivation of Nanoporous TiO₂ via Atomic Layer Deposition of ZrO₂ for Solid-State Dye-Sensitized Solar Cell Applications

et al. 2009

View full text Add to dashboard Cite

We report here the utilization of atomic layer deposition to passivate surface trap states in mesoporous TiO 2 nanoparticles for solid-state dye-sensitized solar cells based on 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD). By depositing ZrO 2 films with angstrom-level precision, coating the mesoporous TiO 2 produces over a two-fold enhancement in short-circuit current density, as compared to a control device. Impedance spectroscopy measurements provide evidence that the ZrO 2 coating reduces recombination losses at the TiO 2 /spiro-OMeTAD interface and passivates localized surface states. Lowfrequency negative capacitances, frequently observed in nanocomposite solar cells, have been associated with the surface-state mediated charge transfer from TiO 2 to the spiro-OMeTAD.

show abstract

“…8, a cell containing a 0.33-nm thick Al 2 O 3 layer exhibited a higher fill factor and V oc than a 0.19-nm thick Al 2 O 3 layer, but its J sc became lower since the electron injection was exponentially dependent on the thickness of the insulating layer (Zhang et al, 2003). 17) As an extreme condition, a very thick MgO layer improved the V oc of a CuIbased cell up to 800 mV, with negligible J sc observed. The above discussion shows that the insulating layer in principle can increase the V oc of the cell greatly through suppressing recombination, but the problem is how to keep the J sc from decreasing at the same time.…”

Section: )mentioning

confidence: 99%

Solid-state dye-sensitized solar cells

Fujishima

Zhang

2005

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

View full text Add to dashboard Cite

Al2O3-coated nanoporous TiO2 electrode for solid-state dye-sensitized solar cell

Cited by 92 publications

References 20 publications

ZnO−Al₂O₃ and ZnO−TiO₂ Core−Shell Nanowire Dye-Sensitized Solar Cells

ZnO−Al₂O₃ and ZnO−TiO₂ Core−Shell Nanowire Dye-Sensitized Solar Cells

Surface Passivation of Nanoporous TiO₂ via Atomic Layer Deposition of ZrO₂ for Solid-State Dye-Sensitized Solar Cell Applications

Solid-state dye-sensitized solar cells

Contact Info

Product

Resources

About

Al2O3-coated nanoporous TiO2 electrode for solid-state dye-sensitized solar cell

Cited by 92 publications

References 20 publications

ZnO−Al2O3 and ZnO−TiO2 Core−Shell Nanowire Dye-Sensitized Solar Cells

ZnO−Al2O3 and ZnO−TiO2 Core−Shell Nanowire Dye-Sensitized Solar Cells

Surface Passivation of Nanoporous TiO2 via Atomic Layer Deposition of ZrO2 for Solid-State Dye-Sensitized Solar Cell Applications

Solid-state dye-sensitized solar cells

Contact Info

Product

Resources

About

ZnO−Al₂O₃ and ZnO−TiO₂ Core−Shell Nanowire Dye-Sensitized Solar Cells

ZnO−Al₂O₃ and ZnO−TiO₂ Core−Shell Nanowire Dye-Sensitized Solar Cells

Surface Passivation of Nanoporous TiO₂ via Atomic Layer Deposition of ZrO₂ for Solid-State Dye-Sensitized Solar Cell Applications