Characterization of titanium dioxide blocking layers in dye-sensitized nanocrystalline solar cells

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Abstract

The properties of thin blocking layers of titanium dioxide used to improve the performance of dye-sensitized nanocrystalline solar cells have been studied. TiO2 blocking layers prepared on fluorine-doped tin oxide-coated glass by spray pyrolysis have been characterized by electrochemical impedance spectroscopy, spectroscopic ellipsometry, and voltammetry. The impedance data reveal the presence of a distribution of surface states at the titanium dioxide-electrolyte interface that is similar to the one seen in the case of nanocrystalline TiO2 films. The influence of the blocking layers on the back transfer of electrons to tri-iodide ions in electrolyte-based dye-sensitized nanocrystalline cells has been studied by open circuit photovoltage decay. The results show that the ability of the blocking layer to prevent the back reaction of electrons with tri-iodide ions in the electrolyte is excellent under short circuit conditions, but is limited under open circuit conditions by electron accumulation at the surface of the titanium dioxide blocking layer.
LanguageEnglish
Pages14394-14400
Number of pages7
JournalJournal of Physical Chemistry B
Volume107
Issue number51
DOIs
StatusPublished - 2003

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Titanium dioxide
Solar cells
Dyes
Electrolytes
Electrons
Spray pyrolysis
Spectroscopic ellipsometry
Networks (circuits)
Ions
Surface states
Voltammetry
Tin oxides
Electrochemical impedance spectroscopy
Fluorine
Short circuit currents
Glass

Cite this

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title = "Characterization of titanium dioxide blocking layers in dye-sensitized nanocrystalline solar cells",
abstract = "The properties of thin blocking layers of titanium dioxide used to improve the performance of dye-sensitized nanocrystalline solar cells have been studied. TiO2 blocking layers prepared on fluorine-doped tin oxide-coated glass by spray pyrolysis have been characterized by electrochemical impedance spectroscopy, spectroscopic ellipsometry, and voltammetry. The impedance data reveal the presence of a distribution of surface states at the titanium dioxide-electrolyte interface that is similar to the one seen in the case of nanocrystalline TiO2 films. The influence of the blocking layers on the back transfer of electrons to tri-iodide ions in electrolyte-based dye-sensitized nanocrystalline cells has been studied by open circuit photovoltage decay. The results show that the ability of the blocking layer to prevent the back reaction of electrons with tri-iodide ions in the electrolyte is excellent under short circuit conditions, but is limited under open circuit conditions by electron accumulation at the surface of the titanium dioxide blocking layer.",
author = "Cameron, {P J} and Peter, {L M}",
note = "ID number: ISI:000187447200041",
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journal = "Journal of Physical Chemistry B",
issn = "1520-6106",
publisher = "American Chemical Society",
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TY - JOUR

T1 - Characterization of titanium dioxide blocking layers in dye-sensitized nanocrystalline solar cells

AU - Cameron,P J

AU - Peter,L M

N1 - ID number: ISI:000187447200041

PY - 2003

Y1 - 2003

N2 - The properties of thin blocking layers of titanium dioxide used to improve the performance of dye-sensitized nanocrystalline solar cells have been studied. TiO2 blocking layers prepared on fluorine-doped tin oxide-coated glass by spray pyrolysis have been characterized by electrochemical impedance spectroscopy, spectroscopic ellipsometry, and voltammetry. The impedance data reveal the presence of a distribution of surface states at the titanium dioxide-electrolyte interface that is similar to the one seen in the case of nanocrystalline TiO2 films. The influence of the blocking layers on the back transfer of electrons to tri-iodide ions in electrolyte-based dye-sensitized nanocrystalline cells has been studied by open circuit photovoltage decay. The results show that the ability of the blocking layer to prevent the back reaction of electrons with tri-iodide ions in the electrolyte is excellent under short circuit conditions, but is limited under open circuit conditions by electron accumulation at the surface of the titanium dioxide blocking layer.

AB - The properties of thin blocking layers of titanium dioxide used to improve the performance of dye-sensitized nanocrystalline solar cells have been studied. TiO2 blocking layers prepared on fluorine-doped tin oxide-coated glass by spray pyrolysis have been characterized by electrochemical impedance spectroscopy, spectroscopic ellipsometry, and voltammetry. The impedance data reveal the presence of a distribution of surface states at the titanium dioxide-electrolyte interface that is similar to the one seen in the case of nanocrystalline TiO2 films. The influence of the blocking layers on the back transfer of electrons to tri-iodide ions in electrolyte-based dye-sensitized nanocrystalline cells has been studied by open circuit photovoltage decay. The results show that the ability of the blocking layer to prevent the back reaction of electrons with tri-iodide ions in the electrolyte is excellent under short circuit conditions, but is limited under open circuit conditions by electron accumulation at the surface of the titanium dioxide blocking layer.

U2 - 10.1021/jp030790+

DO - 10.1021/jp030790+

M3 - Article

VL - 107

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T2 - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

SN - 1520-6106

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ER -