Improving the performance of solid-state dye-sensitized solar cell using MgO-coated TiO2 nanoporous film

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

doi:10.1039/b306118c

Cited by 150 publications

(100 citation statements)

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“…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

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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.

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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

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“…Interestingly, the insulating blocking layer was found to improve the operational stability of the cell under simulated sunlight, possibly by blocking the photooxidative function of TiO 2 . 19) The results of the operational stability of the CuIbased DSSC were rather promising. It can be expected that the CuSCN-based DSSC should exhibit even better operational stability, since CuSCN in itself is more stable than CuI against oxidation.…”

Section: )mentioning

confidence: 89%

“…The output became almost zero after 72 h of continuous illumination . 19) The illuminated area turned from red (the color of the ruthenium dye) to black after the stability test, which was evidence for the existence of cupric oxide. However, when we carried out the stability test under the UV-free illumination (λ > 435 nm), the cell exhibited good operational stability.…”

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confidence: 99%

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Solid-state dye-sensitized solar cells

Fujishima

Zhang

2005

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

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“…Many strategies have been reported to reduce the recombination. One is passivation of TiO 2 surface by coating with metal oxides as a barrier, such as Nb 2 O 5 , 2 metal oxide, 3 MgO, 4 and another is preparation of 1-dimensional (1D) semiconductor structures, such as nanorods, nanotubes, for the fast electron transfer. [5][6][7][8] However, when 1D semiconductor structures were used as working electrodes, low power conversion efficiencies were obtained because their specific surface area was small, resulting in less adsorption of dye.…”

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confidence: 99%

Preparation of TiO₂Double-Layer Films with Echinoid-Like Particles on Nanorods Array for Dye Sensitized Solar Cells

Song¹,

Jang²,

2013

Bulletin of the Korean Chemical Society

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Dye-sensitized solar cells (DSSCs) were intensively studied in the last two decays as alternatives to conventional siliconbased solar cells due to its low cost and relatively high power conversion efficiency.1 TiO 2 is used as a semiconductor layer in DSSCs and the structure influences on the power conversion efficiency significantly. One of the causes which lower the power conversion efficiency is recombination; generally occur on the surface of TiO 2 nanoparticles. Many strategies have been reported to reduce the recombination. One is passivation of TiO 2 surface by coating with metal oxides as a barrier, such as Nb 2 O 5 , 2 metal oxide, 3MgO, 4 and another is preparation of 1-dimensional (1D) semiconductor structures, such as nanorods, nanotubes, for the fast electron transfer.5-8 However, when 1D semiconductor structures were used as working electrodes, low power conversion efficiencies were obtained because their specific surface area was small, resulting in less adsorption of dye. 9,10In this study, we report a double-layer structure for DSSCs consisting of TiO 2 nanorods array (TRA) and echinoid-like particles. This double-layer structure satisfies both fast electron transfer rate and large surface area which are important factors for the high power conversion efficiency.TRA film was prepared by hydrothermal method, reported in the literature.7 In brief, 15 mL D. I. water, 15 mL HCl, and 0.5 mL titanium(IV) isopropoxide (TTIP) were mixed and stirred. FTO glass was placed in the teflon-lined stainless steel autoclave and the prepared solution was added. The hydrothermal synthesis was conducted at 150°C for 10 h, and then, the sample was washed with D. I. water and dried at 70°C.TiO 2 echinoid-like TiO 2 particles were synthesized as a same process reported earlier by our group. 11 0.6 g poly (vinyl alcohol) (PVA) was dissolved in 18 mL dimethyl sulfoxide (DMSO) and TTIP was added to 30 mL 2-propanol. The PVA/DMSO solution and TTIP/2-propanol solution were added dropwise to 600 mL acetic acid under vigorous stirring and the resultant solution was refluxed at 100°C. After 4 days, the synthesized particles were centrifuged and washed with acetone several times and dried at 70°C.For the formation of the double-layer film, the TiO 2 echinoid paste was prepared by using α-terpineol, dibutyl phthalate, lauric acid, and ethyl cellulose. The paste was deposited on the TiO 2 array film by doctor blade method and the resultant was annealed at 450°C for 30 min. The prepared working electrode was immersed into N719 dye in the mixture of acetonitrile and tert-butanol for 18 h. Pt-coated FTO glass was used as a counter electrode, and the electrolyte was prepared with 1-propyl-3-methylimidazolium iodide (PMII), I 2 , LiI, tert-butylpyridine, and acetonitrile. The active area was 0.25 cm 2 . The XRD patterns of TRA film and echinoid-like TiO 2 particles are shown in Figure 1. According to the XRD patterns, the crystal structures of TRA film and echinoid-like TiO 2 particles are rutile and anatase, respectively. As shown i...

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Improving the performance of solid-state dye-sensitized solar cell using MgO-coated TiO2 nanoporous film

Abstract: An ultrathin overlayer of MgO on TiO2 is shown to drastically improve the stability of solid-state dye-sensitized solar cell using CuI as a hole conductor in addition to solar energy conversion efficiency.

Cited by 150 publications

References 10 publications

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

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

Preparation of TiO₂Double-Layer Films with Echinoid-Like Particles on Nanorods Array for Dye Sensitized Solar Cells

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Improving the performance of solid-state dye-sensitized solar cell using MgO-coated TiO2 nanoporous film

Abstract: An ultrathin overlayer of MgO on TiO2 is shown to drastically improve the stability of solid-state dye-sensitized solar cell using CuI as a hole conductor in addition to solar energy conversion efficiency.

Cited by 150 publications

References 10 publications

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

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

Preparation of TiO2Double-Layer Films with Echinoid-Like Particles on Nanorods Array for Dye Sensitized Solar Cells

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

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

Preparation of TiO₂Double-Layer Films with Echinoid-Like Particles on Nanorods Array for Dye Sensitized Solar Cells