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Original title:
Electrochemical Characterization of TiO2 Blocking Layers for Dye-Sensitized Solar Cells
Authors: Kavan, Ladislav
Document type: Papers
Conference/Event: New trends in application of photo and electro catalysis. The Czech-Austrian workshop /6./, Hnanice (CZ), 2013-12-02 / 2013-12-04
Year: 2014
Language: eng
Abstract: Thin compact layers of TiO2 are grown by thermal oxidation of Ti, by spray pyrolysis, by electrochemical deposition, and by atomic layer deposition. These layers are used in dye-sensitized solar cells to prevent recombination of electrons from the substrate (FTO or Ti) with the hole-conducting medium at this interface. The quality of blocking is evaluated electrochemically by methylviologen, ferro/ferricyanide, and spiro-OMeTAD as the model redox probes. Two types of pinholes in the blocking layers are classified, and their effective area is quantified. Frequency-independent Mott–Schottky plots are fitted from electrochemical impedance spectroscopy. Certain films of the thicknesses of several nanometers allow distinguishing the depletion layer formation both in the TiO2 film and in the FTO substrate underneath the titania film. The excellent blocking function of thermally oxidized Ti, electrodeposited film (60 nm), and atomic-layer-deposited films (>6 nm) is documented by the relative pinhole area of less than 1%. However, the blocking behavior of electrodeposited and atomic-layer-deposited films is strongly reduced upon calcination at 500 °C. The blocking function of spray-pyrolyzed films is less good but also less sensitive to calcination. The thermally oxidized Ti is well blocking and insensitive to calcination.
Keywords: dye-sensitized solar cells; electrochemistry; TiO2
Project no.: GA13-07724S (CEP), CM1104
Funding provider: GA ČR, COST
Host item entry: New trends in application of photo and electro catalysis. Proceedings of the 6th Czech-Austrian workshop, ISBN 978-80-7080-886-3
Institution: J. Heyrovsky Institute of Physical Chemistry AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0235690
Permalink: http://www.nusl.cz/ntk/nusl-174910
The record appears in these collections:
Research > Institutes ASCR > J. Heyrovsky Institute of Physical Chemistry
Conference materials > Papers
Authors: Kavan, Ladislav
Document type: Papers
Conference/Event: New trends in application of photo and electro catalysis. The Czech-Austrian workshop /6./, Hnanice (CZ), 2013-12-02 / 2013-12-04
Year: 2014
Language: eng
Abstract: Thin compact layers of TiO2 are grown by thermal oxidation of Ti, by spray pyrolysis, by electrochemical deposition, and by atomic layer deposition. These layers are used in dye-sensitized solar cells to prevent recombination of electrons from the substrate (FTO or Ti) with the hole-conducting medium at this interface. The quality of blocking is evaluated electrochemically by methylviologen, ferro/ferricyanide, and spiro-OMeTAD as the model redox probes. Two types of pinholes in the blocking layers are classified, and their effective area is quantified. Frequency-independent Mott–Schottky plots are fitted from electrochemical impedance spectroscopy. Certain films of the thicknesses of several nanometers allow distinguishing the depletion layer formation both in the TiO2 film and in the FTO substrate underneath the titania film. The excellent blocking function of thermally oxidized Ti, electrodeposited film (60 nm), and atomic-layer-deposited films (>6 nm) is documented by the relative pinhole area of less than 1%. However, the blocking behavior of electrodeposited and atomic-layer-deposited films is strongly reduced upon calcination at 500 °C. The blocking function of spray-pyrolyzed films is less good but also less sensitive to calcination. The thermally oxidized Ti is well blocking and insensitive to calcination.
Keywords: dye-sensitized solar cells; electrochemistry; TiO2
Project no.: GA13-07724S (CEP), CM1104
Funding provider: GA ČR, COST
Host item entry: New trends in application of photo and electro catalysis. Proceedings of the 6th Czech-Austrian workshop, ISBN 978-80-7080-886-3
Institution: J. Heyrovsky Institute of Physical Chemistry AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0235690
Permalink: http://www.nusl.cz/ntk/nusl-174910
The record appears in these collections:
Research > Institutes ASCR > J. Heyrovsky Institute of Physical Chemistry
Conference materials > Papers
Record created 2014-08-28, last modified 2021-11-24