General strategy for fabricating transparent TiO2 nanotube arrays for dye-sensitized photoelectrodes: Illumination geometry and transport properties

Jin Young Kim, Jun Hong Noh, Kai Zhu, Adam F. Halverson, Nathan R. Neale, Sangbaek Park, Kug Sun Hong, Arthur J. Frank

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

We report on the preparation of transparent oriented titania nanotube (NT) photoelectrodes and the effect of illumination direction on light harvesting, electron transport, and recombination in dye-sensitized solar cells (DSSCs) incorporating these electrodes. High solar conversion efficiency requires that the incident light enters the cell from the photoelectrode side. However, it has been synthetically challenging to prepare transparent TiO2 NT electrodes by directly anodizing Ti metal films on transparent conducting oxide (TCO) substrates because of the difficulties of controlling the synthetic conditions. We describe a general synthetic strategy for fabricating transparent TiO2 NT films on TCO substrates. With the aid of a conducting Nb-doped TiO2 (NTO) layer between the Ti film and TCO substrate, the Ti film was anodized completely without degrading the TCO. The NTO layer was found to protect the TCO from degradation through a self-terminating mechanism by arresting the electric field-assisted dissolution process at the NT-NTO interface. The illumination direction and wavelength of the light incident on the DSSCs were shown to strongly influence the incident photon-to-current conversion efficiency, light-harvesting, and charge-collection properties, which, in turn, affect the photocurrent density, photovoltage, and solar energy conversion efficiency. Effects of NT film thickness on the properties and performance of DSSCs were also examined. Illuminating the cell from the photoelectrode substantially increased the conversion efficiency compared with illuminating it from the counter-electrode side.

Original languageEnglish
Pages (from-to)2647-2656
Number of pages10
JournalACS Nano
Volume5
Issue number4
DOIs
Publication statusPublished - 2011 Apr 26
Externally publishedYes

Fingerprint

Transport properties
Oxides
Nanotubes
nanotubes
Coloring Agents
Dyes
Lighting
transport properties
dyes
illumination
Conversion efficiency
conduction
Geometry
geometry
oxides
solar cells
Electrodes
Substrates
illuminating
electrodes

Keywords

  • anodization
  • charge transport
  • dye-sensitized solar cells
  • illumination geometry
  • Nb-doped TiO
  • TiO nanotube
  • transparent

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

General strategy for fabricating transparent TiO2 nanotube arrays for dye-sensitized photoelectrodes : Illumination geometry and transport properties. / Kim, Jin Young; Noh, Jun Hong; Zhu, Kai; Halverson, Adam F.; Neale, Nathan R.; Park, Sangbaek; Hong, Kug Sun; Frank, Arthur J.

In: ACS Nano, Vol. 5, No. 4, 26.04.2011, p. 2647-2656.

Research output: Contribution to journalArticle

Kim, Jin Young ; Noh, Jun Hong ; Zhu, Kai ; Halverson, Adam F. ; Neale, Nathan R. ; Park, Sangbaek ; Hong, Kug Sun ; Frank, Arthur J. / General strategy for fabricating transparent TiO2 nanotube arrays for dye-sensitized photoelectrodes : Illumination geometry and transport properties. In: ACS Nano. 2011 ; Vol. 5, No. 4. pp. 2647-2656.
@article{d6a10253b50147cb95784b2399756a18,
title = "General strategy for fabricating transparent TiO2 nanotube arrays for dye-sensitized photoelectrodes: Illumination geometry and transport properties",
abstract = "We report on the preparation of transparent oriented titania nanotube (NT) photoelectrodes and the effect of illumination direction on light harvesting, electron transport, and recombination in dye-sensitized solar cells (DSSCs) incorporating these electrodes. High solar conversion efficiency requires that the incident light enters the cell from the photoelectrode side. However, it has been synthetically challenging to prepare transparent TiO2 NT electrodes by directly anodizing Ti metal films on transparent conducting oxide (TCO) substrates because of the difficulties of controlling the synthetic conditions. We describe a general synthetic strategy for fabricating transparent TiO2 NT films on TCO substrates. With the aid of a conducting Nb-doped TiO2 (NTO) layer between the Ti film and TCO substrate, the Ti film was anodized completely without degrading the TCO. The NTO layer was found to protect the TCO from degradation through a self-terminating mechanism by arresting the electric field-assisted dissolution process at the NT-NTO interface. The illumination direction and wavelength of the light incident on the DSSCs were shown to strongly influence the incident photon-to-current conversion efficiency, light-harvesting, and charge-collection properties, which, in turn, affect the photocurrent density, photovoltage, and solar energy conversion efficiency. Effects of NT film thickness on the properties and performance of DSSCs were also examined. Illuminating the cell from the photoelectrode substantially increased the conversion efficiency compared with illuminating it from the counter-electrode side.",
keywords = "anodization, charge transport, dye-sensitized solar cells, illumination geometry, Nb-doped TiO, TiO nanotube, transparent",
author = "Kim, {Jin Young} and Noh, {Jun Hong} and Kai Zhu and Halverson, {Adam F.} and Neale, {Nathan R.} and Sangbaek Park and Hong, {Kug Sun} and Frank, {Arthur J.}",
year = "2011",
month = "4",
day = "26",
doi = "10.1021/nn200440u",
language = "English",
volume = "5",
pages = "2647--2656",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "4",

}

TY - JOUR

T1 - General strategy for fabricating transparent TiO2 nanotube arrays for dye-sensitized photoelectrodes

T2 - Illumination geometry and transport properties

AU - Kim, Jin Young

AU - Noh, Jun Hong

AU - Zhu, Kai

AU - Halverson, Adam F.

AU - Neale, Nathan R.

AU - Park, Sangbaek

AU - Hong, Kug Sun

AU - Frank, Arthur J.

PY - 2011/4/26

Y1 - 2011/4/26

N2 - We report on the preparation of transparent oriented titania nanotube (NT) photoelectrodes and the effect of illumination direction on light harvesting, electron transport, and recombination in dye-sensitized solar cells (DSSCs) incorporating these electrodes. High solar conversion efficiency requires that the incident light enters the cell from the photoelectrode side. However, it has been synthetically challenging to prepare transparent TiO2 NT electrodes by directly anodizing Ti metal films on transparent conducting oxide (TCO) substrates because of the difficulties of controlling the synthetic conditions. We describe a general synthetic strategy for fabricating transparent TiO2 NT films on TCO substrates. With the aid of a conducting Nb-doped TiO2 (NTO) layer between the Ti film and TCO substrate, the Ti film was anodized completely without degrading the TCO. The NTO layer was found to protect the TCO from degradation through a self-terminating mechanism by arresting the electric field-assisted dissolution process at the NT-NTO interface. The illumination direction and wavelength of the light incident on the DSSCs were shown to strongly influence the incident photon-to-current conversion efficiency, light-harvesting, and charge-collection properties, which, in turn, affect the photocurrent density, photovoltage, and solar energy conversion efficiency. Effects of NT film thickness on the properties and performance of DSSCs were also examined. Illuminating the cell from the photoelectrode substantially increased the conversion efficiency compared with illuminating it from the counter-electrode side.

AB - We report on the preparation of transparent oriented titania nanotube (NT) photoelectrodes and the effect of illumination direction on light harvesting, electron transport, and recombination in dye-sensitized solar cells (DSSCs) incorporating these electrodes. High solar conversion efficiency requires that the incident light enters the cell from the photoelectrode side. However, it has been synthetically challenging to prepare transparent TiO2 NT electrodes by directly anodizing Ti metal films on transparent conducting oxide (TCO) substrates because of the difficulties of controlling the synthetic conditions. We describe a general synthetic strategy for fabricating transparent TiO2 NT films on TCO substrates. With the aid of a conducting Nb-doped TiO2 (NTO) layer between the Ti film and TCO substrate, the Ti film was anodized completely without degrading the TCO. The NTO layer was found to protect the TCO from degradation through a self-terminating mechanism by arresting the electric field-assisted dissolution process at the NT-NTO interface. The illumination direction and wavelength of the light incident on the DSSCs were shown to strongly influence the incident photon-to-current conversion efficiency, light-harvesting, and charge-collection properties, which, in turn, affect the photocurrent density, photovoltage, and solar energy conversion efficiency. Effects of NT film thickness on the properties and performance of DSSCs were also examined. Illuminating the cell from the photoelectrode substantially increased the conversion efficiency compared with illuminating it from the counter-electrode side.

KW - anodization

KW - charge transport

KW - dye-sensitized solar cells

KW - illumination geometry

KW - Nb-doped TiO

KW - TiO nanotube

KW - transparent

UR - http://www.scopus.com/inward/record.url?scp=79955441904&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79955441904&partnerID=8YFLogxK

U2 - 10.1021/nn200440u

DO - 10.1021/nn200440u

M3 - Article

C2 - 21395234

AN - SCOPUS:79955441904

VL - 5

SP - 2647

EP - 2656

JO - ACS Nano

JF - ACS Nano

SN - 1936-0851

IS - 4

ER -