Surface passivation of nanoporous TiO2 via atomic layer deposition of ZrO2 for solid-state dye-sensitized solar cell applications

Tina C. Li; Márcio S. Góes; Francisco Fabregat-Santiago; Juan Bisquert; Paulo R. Bueno; Chaiya Praslttichal; Joseph T. Hupp; Tobin J. Marks

doi:10.1021/jp906573w

Surface passivation of nanoporous TiO₂ via atomic layer deposition of ZrO₂ for solid-state dye-sensitized solar cell applications

Tina C. Li, Márcio S. Góes, Francisco Fabregat-Santiago^*, Juan Bisquert, Paulo R. Bueno, Chaiya Praslttichal, Joseph T. Hupp, Tobin J. Marks

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

146 Scopus citations

Abstract

We report here the utilization of atomic layer deposition to passivate surface trap states in mesoporous TiO₂ nanoparticles for solid-state dye-sensitized solar cells based on 2,2',7,7'-tetrak.is(N, N-di-p- methoxyphenylamine)9,9'-spirobifluorene (spiro-OMeTAD). By depositing ZrO ₂ films with angstrom-level precision, coating the inesoporous TiO₂ produces over a two-fold enhancement in short-circuit current density, as compared to a control device. Impedance spectroscopy measurements provide evidence that the ZrO₂ coating reduces recombination losses at the TiO₂/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 TiO₂ to the spiro-OMeTAD.

Original language	English (US)
Pages (from-to)	18385-18390
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	113
Issue number	42
DOIs	https://doi.org/10.1021/jp906573w
State	Published - 2009

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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@article{c31e3ec6b1d1474990e1c9e4c0989f09,

title = "Surface passivation of nanoporous TiO2 via atomic layer deposition of ZrO2 for solid-state dye-sensitized solar cell applications",

abstract = "We report here the utilization of atomic layer deposition to passivate surface trap states in mesoporous TiO2 nanoparticles for solid-state dye-sensitized solar cells based on 2,2',7,7'-tetrak.is(N, N-di-p- methoxyphenylamine)9,9'-spirobifluorene (spiro-OMeTAD). By depositing ZrO 2 films with angstrom-level precision, coating the inesoporous TiO2 produces over a two-fold enhancement in short-circuit current density, as compared to a control device. Impedance spectroscopy measurements provide evidence that the ZrO2 coating reduces recombination losses at the TiO2/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 TiO2 to the spiro-OMeTAD.",

author = "Li, {Tina C.} and G{\'o}es, {M{\'a}rcio S.} and Francisco Fabregat-Santiago and Juan Bisquert and Bueno, {Paulo R.} and Chaiya Praslttichal and Hupp, {Joseph T.} and Marks, {Tobin J.}",

year = "2009",

doi = "10.1021/jp906573w",

language = "English (US)",

volume = "113",

pages = "18385--18390",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

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T1 - Surface passivation of nanoporous TiO2 via atomic layer deposition of ZrO2 for solid-state dye-sensitized solar cell applications

AU - Li, Tina C.

AU - Góes, Márcio S.

AU - Fabregat-Santiago, Francisco

AU - Bisquert, Juan

AU - Bueno, Paulo R.

AU - Praslttichal, Chaiya

AU - Hupp, Joseph T.

AU - Marks, Tobin J.

PY - 2009

Y1 - 2009

N2 - We report here the utilization of atomic layer deposition to passivate surface trap states in mesoporous TiO2 nanoparticles for solid-state dye-sensitized solar cells based on 2,2',7,7'-tetrak.is(N, N-di-p- methoxyphenylamine)9,9'-spirobifluorene (spiro-OMeTAD). By depositing ZrO 2 films with angstrom-level precision, coating the inesoporous TiO2 produces over a two-fold enhancement in short-circuit current density, as compared to a control device. Impedance spectroscopy measurements provide evidence that the ZrO2 coating reduces recombination losses at the TiO2/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 TiO2 to the spiro-OMeTAD.

AB - We report here the utilization of atomic layer deposition to passivate surface trap states in mesoporous TiO2 nanoparticles for solid-state dye-sensitized solar cells based on 2,2',7,7'-tetrak.is(N, N-di-p- methoxyphenylamine)9,9'-spirobifluorene (spiro-OMeTAD). By depositing ZrO 2 films with angstrom-level precision, coating the inesoporous TiO2 produces over a two-fold enhancement in short-circuit current density, as compared to a control device. Impedance spectroscopy measurements provide evidence that the ZrO2 coating reduces recombination losses at the TiO2/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 TiO2 to the spiro-OMeTAD.

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DO - 10.1021/jp906573w

M3 - Article

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SN - 1932-7447

VL - 113

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 42

ER -

Surface passivation of nanoporous TiO₂ via atomic layer deposition of ZrO₂ for solid-state dye-sensitized solar cell applications

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