Jump to main content
Jump to site search

Issue 20, 2012

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

Author affiliations

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

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements