Název: Electrochemical Characterization of TiO2 Blocking Layers for Dye-Sensitized Solar Cells
Autoři: Kavan, Ladislav
Typ dokumentu: Příspěvky z konference
Konference/Akce: New trends in application of photo and electro catalysis. The Czech-Austrian workshop /6./, Hnanice (CZ), 2013-12-02 / 2013-12-04
Rok: 2014
Jazyk: eng
Abstrakt: 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.
Klíčová slova: dye-sensitized solar cells; electrochemistry; TiO2
Číslo projektu: GA13-07724S (CEP), CM1104
Poskytovatel projektu: GA ČR, COST
Zdrojový dokument: New trends in application of photo and electro catalysis. Proceedings of the 6th Czech-Austrian workshop, ISBN 978-80-7080-886-3

Instituce: Ústav fyzikální chemie J. Heyrovského AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0235690

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-174910


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav fyzikální chemie J. Heyrovského
Konferenční materiály > Příspěvky z konference