One-step synthesis of vertically aligned anatase thornbush-like TiO 2 nanowire arrays on transparent conducting oxides for solid-state dye-sensitized solar cells

Dong Kyu Roh, Won Seok Chi, Sung Hoon Ahn, Harim Jeon, Jong Hak Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Herein, we report a facile synthesis of high-density anatase-phase vertically aligned thornbush-like TiO2 nanowires (TBWs) on transparent conducting oxide glasses. Morphologically controllable TBW arrays of 9 μm in length are generated through a one-step hydrothermal reaction at 200 °C over 11 h using potassium titanium oxide oxalate dehydrate, diethylene glycol (DEG), and water. The TBWs consist of a large number of nanoplates or nanorods, as confirmed by SEM and TEM imaging. The morphologies of TBWs are controllable by adjusting DEG/water ratios. TBW diameters gradually decrease from 600 (TBW600) to 400 (TBW400) to 200 nm (TBW200) and morphologies change from nanoplates to nanorods with an increase in DEG content. TBWs are utilized as photoanodes for quasi-solid-state dye-sensitized solar cells (qssDSSCs) and solid-state DSSCs (ssDSSCs). The energy-conversion efficiency of qssDSSCs is in the order: TBW200 (5.2 %)>TBW400 (4.5 %)>TBW600 (3.4 %). These results can be attributed to the different surface areas, light-scattering effects, and charge transport rates, as confirmed by dye-loading measurements, reflectance spectroscopy, and incident photon-to-electron conversion efficiency and intensity-modulated photovoltage spectroscopy/intensity-modulated photocurrent spectroscopy analyses. TBW200 is further treated with a graft-copolymer-directed organized mesoporous TiO2 to increase the surface area and interconnectivity of TBWs. As a result, the energy-conversion efficiency of the ssDSSC increases to 6.7 % at 100 mW cm-2, which is among the highest values for N719-dye-based ssDSSCs. There′s something good behind the thorn: High-density anatase-phase vertically aligned thornbush-like TiO 2 nanowires on transparent conducting oxide (TCO) glasses result in high-efficiency solid-state dye-sensitized solar cells, which exhibits one of the highest values observed for N719 dyes. This can be attributed to improved surface areas, light-scattering effects, and charge transport rates.

Original languageEnglish
Pages (from-to)1384-1391
Number of pages8
JournalChemSusChem
Volume6
Issue number8
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

anatase
Titanium dioxide
Oxides
Nanowires
dye
oxide
Glycols
Conversion efficiency
Coloring Agents
Dyes
surface area
spectroscopy
Spectroscopy
light scattering
Nanorods
Energy conversion
Light scattering
Charge transfer
glass
Glass

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

Cite this

@article{5942c8677d7c4df3b208f8911a838b2f,
title = "One-step synthesis of vertically aligned anatase thornbush-like TiO 2 nanowire arrays on transparent conducting oxides for solid-state dye-sensitized solar cells",
abstract = "Herein, we report a facile synthesis of high-density anatase-phase vertically aligned thornbush-like TiO2 nanowires (TBWs) on transparent conducting oxide glasses. Morphologically controllable TBW arrays of 9 μm in length are generated through a one-step hydrothermal reaction at 200 °C over 11 h using potassium titanium oxide oxalate dehydrate, diethylene glycol (DEG), and water. The TBWs consist of a large number of nanoplates or nanorods, as confirmed by SEM and TEM imaging. The morphologies of TBWs are controllable by adjusting DEG/water ratios. TBW diameters gradually decrease from 600 (TBW600) to 400 (TBW400) to 200 nm (TBW200) and morphologies change from nanoplates to nanorods with an increase in DEG content. TBWs are utilized as photoanodes for quasi-solid-state dye-sensitized solar cells (qssDSSCs) and solid-state DSSCs (ssDSSCs). The energy-conversion efficiency of qssDSSCs is in the order: TBW200 (5.2 {\%})>TBW400 (4.5 {\%})>TBW600 (3.4 {\%}). These results can be attributed to the different surface areas, light-scattering effects, and charge transport rates, as confirmed by dye-loading measurements, reflectance spectroscopy, and incident photon-to-electron conversion efficiency and intensity-modulated photovoltage spectroscopy/intensity-modulated photocurrent spectroscopy analyses. TBW200 is further treated with a graft-copolymer-directed organized mesoporous TiO2 to increase the surface area and interconnectivity of TBWs. As a result, the energy-conversion efficiency of the ssDSSC increases to 6.7 {\%} at 100 mW cm-2, which is among the highest values for N719-dye-based ssDSSCs. There′s something good behind the thorn: High-density anatase-phase vertically aligned thornbush-like TiO 2 nanowires on transparent conducting oxide (TCO) glasses result in high-efficiency solid-state dye-sensitized solar cells, which exhibits one of the highest values observed for N719 dyes. This can be attributed to improved surface areas, light-scattering effects, and charge transport rates.",
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One-step synthesis of vertically aligned anatase thornbush-like TiO 2 nanowire arrays on transparent conducting oxides for solid-state dye-sensitized solar cells. / Roh, Dong Kyu; Chi, Won Seok; Ahn, Sung Hoon; Jeon, Harim; Kim, Jong Hak.

In: ChemSusChem, Vol. 6, No. 8, 01.01.2013, p. 1384-1391.

Research output: Contribution to journalArticle

TY - JOUR

T1 - One-step synthesis of vertically aligned anatase thornbush-like TiO 2 nanowire arrays on transparent conducting oxides for solid-state dye-sensitized solar cells

AU - Roh, Dong Kyu

AU - Chi, Won Seok

AU - Ahn, Sung Hoon

AU - Jeon, Harim

AU - Kim, Jong Hak

PY - 2013/1/1

Y1 - 2013/1/1

N2 - Herein, we report a facile synthesis of high-density anatase-phase vertically aligned thornbush-like TiO2 nanowires (TBWs) on transparent conducting oxide glasses. Morphologically controllable TBW arrays of 9 μm in length are generated through a one-step hydrothermal reaction at 200 °C over 11 h using potassium titanium oxide oxalate dehydrate, diethylene glycol (DEG), and water. The TBWs consist of a large number of nanoplates or nanorods, as confirmed by SEM and TEM imaging. The morphologies of TBWs are controllable by adjusting DEG/water ratios. TBW diameters gradually decrease from 600 (TBW600) to 400 (TBW400) to 200 nm (TBW200) and morphologies change from nanoplates to nanorods with an increase in DEG content. TBWs are utilized as photoanodes for quasi-solid-state dye-sensitized solar cells (qssDSSCs) and solid-state DSSCs (ssDSSCs). The energy-conversion efficiency of qssDSSCs is in the order: TBW200 (5.2 %)>TBW400 (4.5 %)>TBW600 (3.4 %). These results can be attributed to the different surface areas, light-scattering effects, and charge transport rates, as confirmed by dye-loading measurements, reflectance spectroscopy, and incident photon-to-electron conversion efficiency and intensity-modulated photovoltage spectroscopy/intensity-modulated photocurrent spectroscopy analyses. TBW200 is further treated with a graft-copolymer-directed organized mesoporous TiO2 to increase the surface area and interconnectivity of TBWs. As a result, the energy-conversion efficiency of the ssDSSC increases to 6.7 % at 100 mW cm-2, which is among the highest values for N719-dye-based ssDSSCs. There′s something good behind the thorn: High-density anatase-phase vertically aligned thornbush-like TiO 2 nanowires on transparent conducting oxide (TCO) glasses result in high-efficiency solid-state dye-sensitized solar cells, which exhibits one of the highest values observed for N719 dyes. This can be attributed to improved surface areas, light-scattering effects, and charge transport rates.

AB - Herein, we report a facile synthesis of high-density anatase-phase vertically aligned thornbush-like TiO2 nanowires (TBWs) on transparent conducting oxide glasses. Morphologically controllable TBW arrays of 9 μm in length are generated through a one-step hydrothermal reaction at 200 °C over 11 h using potassium titanium oxide oxalate dehydrate, diethylene glycol (DEG), and water. The TBWs consist of a large number of nanoplates or nanorods, as confirmed by SEM and TEM imaging. The morphologies of TBWs are controllable by adjusting DEG/water ratios. TBW diameters gradually decrease from 600 (TBW600) to 400 (TBW400) to 200 nm (TBW200) and morphologies change from nanoplates to nanorods with an increase in DEG content. TBWs are utilized as photoanodes for quasi-solid-state dye-sensitized solar cells (qssDSSCs) and solid-state DSSCs (ssDSSCs). The energy-conversion efficiency of qssDSSCs is in the order: TBW200 (5.2 %)>TBW400 (4.5 %)>TBW600 (3.4 %). These results can be attributed to the different surface areas, light-scattering effects, and charge transport rates, as confirmed by dye-loading measurements, reflectance spectroscopy, and incident photon-to-electron conversion efficiency and intensity-modulated photovoltage spectroscopy/intensity-modulated photocurrent spectroscopy analyses. TBW200 is further treated with a graft-copolymer-directed organized mesoporous TiO2 to increase the surface area and interconnectivity of TBWs. As a result, the energy-conversion efficiency of the ssDSSC increases to 6.7 % at 100 mW cm-2, which is among the highest values for N719-dye-based ssDSSCs. There′s something good behind the thorn: High-density anatase-phase vertically aligned thornbush-like TiO 2 nanowires on transparent conducting oxide (TCO) glasses result in high-efficiency solid-state dye-sensitized solar cells, which exhibits one of the highest values observed for N719 dyes. This can be attributed to improved surface areas, light-scattering effects, and charge transport rates.

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