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Issue 20, 2012
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Photovoltaic characteristics and dye regeneration kinetics in D149-sensitized ZnO with varied dye loading and film thickness

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Abstract

Porous ZnO electrodes on fluorine-doped tin oxide (FTO) were prepared by electrochemical deposition from an O2-saturated ZnCl2 solution in the presence of eosin Y as a structure directing agent (SDA). Sensitization was reached by desorption of the SDA and subsequent adsorption of the indoline dye D149. The influence of film thickness and dye concentration in the films on their photovoltaic characteristics, recombination, and dye regeneration kinetics was investigated. The recombination kinetics was analyzed by time-resolved photovoltage measurements. The dye regeneration by iodide ions in the electrolyte was investigated using scanning electrochemical microscopy (SECM) feedback mode approach curves. Analysis of a SECM kinetic model shows strongly different effective D149 regeneration rate constants Image ID:c2cp40798a-t1.gif for D149–ZnO electrodes of systematically varied film thickness and dye loading. It was found that the short-circuit current density Jsc and Image ID:c2cp40798a-t2.gif correlated directly with the adsorbed dye concentration. Image ID:c2cp40798a-t3.gif was found to be independent of the dye loading but correlated strongly with the dye concentration in the film or inversely with the film thickness. Furthermore, we discussed the perspective of correlating macroscopic cell characteristics with SECM kinetics data.

Graphical abstract: Photovoltaic characteristics and dye regeneration kinetics in D149-sensitized ZnO with varied dye loading and film thickness

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Supplementary files

Article information


Submitted
13 Mar 2012
Accepted
26 Mar 2012
First published
26 Mar 2012

Phys. Chem. Chem. Phys., 2012,14, 7533-7542
Article type
Paper

Photovoltaic characteristics and dye regeneration kinetics in D149-sensitized ZnO with varied dye loading and film thickness

U. M. Tefashe, M. Rudolph, H. Miura, D. Schlettwein and G. Wittstock, Phys. Chem. Chem. Phys., 2012, 14, 7533
DOI: 10.1039/C2CP40798A

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