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Přípava Grätzelova solárního článku
Gerlich, Jakub ; Strachala, Dávid (oponent) ; Kadlec, Michal (vedoucí práce)
Bakalárska práca rieši problematiku farbivami senzibilizovaných solárnych článkov. Práca uvádza princíp fungovania týchto článkov. Ďalej rozoberá použitie rôznych typov farbív, protielektród, elektrolytov a vodivých skiel. Práca obsahuje tiež princípy merania účinnosti solárnych článkov. V práci sa tiež rozoberá spôsob výroby daných článkov. Praktická časť je zameraná na výrobu prototypov článkov a meranie ich parametrov.
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Přípava Grätzelova solárního článku
Gerlich, Jakub ; Strachala, Dávid (oponent) ; Kadlec, Michal (vedoucí práce)
Bakalárska práca rieši problematiku farbivami senzibilizovaných solárnych článkov. Práca uvádza princíp fungovania týchto článkov. Ďalej rozoberá použitie rôznych typov farbív, protielektród, elektrolytov a vodivých skiel. Práca obsahuje tiež princípy merania účinnosti solárnych článkov. V práci sa tiež rozoberá spôsob výroby daných článkov. Praktická časť je zameraná na výrobu prototypov článkov a meranie ich parametrov.
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Electrochemical Characterization of TiO2 Blocking Layers for Dye-Sensitized Solar Cells
Kavan, Ladislav
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.
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DYE SENSITISED SOLAR CELLS: NEW CHALLENGES FROM GRAPHENE CATHODE AND IODINE-FREE ELECTROLYTE
Kavan, Ladislav
Graphene nanoplatelets (GNP) in the form of thin semitransparent film on F-doped SnO2 (FTO) exhibit high electrocatalytic activity for Co(L)2; where L is 6-(lH-pyrazol-l-yl)- 2,2‘-bipyridine. GNP films with optical transmission below 88% are outperforming the activity of platinized FTO for the Co2+/3+(L)2 redox reaction. Dye-sensitized solar cells with Y123 dye adsorbed on TiO2 photoanode achieved energy conversion efficiencies between 8 to 10 % for both GNP and Pt-based cathodes. However, the cell with GNP cathode is superior to that with Pt-FTO cathode in fill factors and in the efficiency at higher illumination intensities.
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