Journal article

Publication year: 2012

Pages: 7533-7542

Journal: Physical Chemistry Chemical Physics

Volume number: 14

Issue number: 20

ISSN: 1463-9076

eISSN: 1463-9084

DOI Link: https://doi.org/10.1039/c2cp40798a

Publisher: Royal Society of Chemistry

Abstract: 
Porous ZnO electrodes on fluorine-doped tin oxide (FTO) were prepared by electrochemical deposition from an O-2-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 k'(ox) for D149-ZnO electrodes of systematically varied film thickness and dye loading. It was found that the short-circuit current density J(sc) and k'(ox) correlated directly with the adsorbed dye concentration. k'(ox) 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.

Harvard Citation style: Tefashe, U., Rudolph, M., Miura, H., Schlettwein, D. and Wittstock, G. (2012) Photovoltaic characteristics and dye regeneration kinetics in D149-sensitized ZnO with varied dye loading and film thickness, Physical Chemistry Chemical Physics, 14(20), pp. 7533-7542. https://doi.org/10.1039/c2cp40798a

APA Citation style: Tefashe, U., Rudolph, M., Miura, H., Schlettwein, D., & Wittstock, G. (2012). Photovoltaic characteristics and dye regeneration kinetics in D149-sensitized ZnO with varied dye loading and film thickness. Physical Chemistry Chemical Physics. 14(20), 7533-7542. https://doi.org/10.1039/c2cp40798a