Research & Faculty

Default Header Image

Strategies for Optimizing the Performance of Cyclometalated Ruthenium Sensitizers for Dye-Sensitized Solar Cells

TitleStrategies for Optimizing the Performance of Cyclometalated Ruthenium Sensitizers for Dye-Sensitized Solar Cells
Publication TypeJournal Article
Year of Publication2011
AuthorsBomben, PG, Theriault, KD, Berlinguette, CP
JournalEUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Pagination1806-1814
Date PublishedAPR
ISSN1434-1948
Abstract

Pursuant to our goal of optimizing the performance of cyclometalated Ru sensitizers in the dye-sensitized solar cell (DSSC), the physicochemical properties of a series of tris-heteroleptic Ru-II complexes are reported. Each of these complexes contains a metal ligated by: (i) a bidentate 2,2'-bipyridine-4,4'-dicarboxylic acid (dcbpy) ligand to anchor the dye to the TiO2 surface; (ii) a cyclometalating ligand - with electron-withdrawing groups to ensure a sufficiently high oxidation potential for dye regeneration in the DSSC; and (iii) a 2,2'-bipyridine (bpy) ligand. UV/Vis and electrochemical data reveal that each complex exhibits broad metal-to-ligand charge transfer (MLCT) bands of significant intensity (epsilon = 1.0-2.3 x 10(4)M(-1)cm(-1)) in the visible region, and ground- and excited-state redox potentials that are appropriate for sensitizing TiO2. Analysis of the dyes in the DSSC highlights the sensitivity of cell performance to the oxidation potential for each of the dyes, which has important implications in the development of cyclometalated Ru sensitizers.

DOI10.1002/ejic.201001345