Issue 34, 2018

Correlating cobalt redox couples to photovoltage in the dye-sensitized solar cell

Abstract

We report a series of structurally analogous cobalt mediators related to [Co-bpy]Z (bpy = 2,2′-bipyrimidine, Z = 2+ or 3+) to demonstrate a linear relationship between the redox potential of the Co(III/II)-based redox couple (Emed) and open-circuit voltage (VOC) of the DSSC. The Emed values vary from 0.42 to 1.07 V vs. NHE depending on the number of nitrogen atoms and the presence of tert-butyl substituents on the ligand. A 64-mV gain in photovoltage was calculated for every +100 mV shift in Emed. Differences in the mediator sizes, diffusion coefficients, light absorption profiles, and spin state configurations for the complexes were not significant and therefore not expected to contribute to changes in the VOC. A decrease in the photocurrent, downward shift in quasi-Fermi level (EF,n) and shorter electron lifetime (Tn) with increasingly positive Emed were instead attributed to enhanced electron recombination from the TiO2 film to oxidized mediator species in the electrolyte.

Graphical abstract: Correlating cobalt redox couples to photovoltage in the dye-sensitized solar cell

Supplementary files

Article information

Article type
Paper
Submitted
12 Мам. 2018
Accepted
25 Мау. 2018
First published
20 Шіл. 2018

Dalton Trans., 2018,47, 11942-11952

Correlating cobalt redox couples to photovoltage in the dye-sensitized solar cell

K. Y. Chen, P. A. Schauer, B. O. Patrick and C. P. Berlinguette, Dalton Trans., 2018, 47, 11942 DOI: 10.1039/C8DT01921E

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

Spotlight

Advertisements