4,4′,5,5′-Tetracarboxy-2,2′-bipyridine
Ru(II) Sensitizers for Dye-Sensitized Solar Cells
Chun-Cheng Chou
Fa-Chun Hu
Kuan-Lin Wu
Tainan Duan
Yun Chi
Shih-Hung Liu
Gene-Hsiang Lee
Pi-Tai Chou
10.1021/ic501178f.s001
https://acs.figshare.com/articles/journal_contribution/4_4_5_5_Tetracarboxy_2_2_bipyridine_Ru_II_Sensitizers_for_Dye_Sensitized_Solar_Cells/2263423
Two Ru(II) sensitizers TCR-1 and
TCR-2 bearing four carboxy anchoring groups were prepared using 4,4′,5,5′-tetraethoxycarbonyl-2,2′-bipyridine
chelate and 4-(5-hexylthien-2-yl)-2-(3-trifluoromethyl-1<i>H</i>-pyrazol-5-yl)pyridine and 6-<i>t</i>-butyl-1-(3-trifluoromethyl-1<i>H</i>-pyrazol-5-yl)isoquinoline, respectively. Dissolution
of these sensitizers in DMF solution afforded a light green solution
up to 10<sup>–5</sup> M, for which their color gradually turned
red upon further dilution and deposition on the surface of a TiO<sub>2</sub> photoanode due to the spontaneous deprotonation of carboxylic
acid groups. These sensitizers were characterized using electrochemical
means and structural analysis time-dependent density functional theory
(TDDFT) simulation and were also subjected to actual device fabrication.
The as-fabricated DSC devices showed overall efficiencies η
= 6.16% and 6.23% versus their 4,4′-dicarboxy counterparts
TFRS-2 and TFRS-52 with higher efficiencies of 7.57% and 8.09%, using
electrolyte with 0.2 M LiI additive. Their inferior efficiencies are
possibly caused by the combination of blue-shifted absorption on TiO<sub>2</sub>, inadequate dye loading, and the perpendicularly oriented
central carboxy groups.
2014-08-18 00:00:00
Ru
sensitizer
0.2 M LiI additive
efficiencies η
TFRS
dye loading
TCR
DMF solution
efficiency
DSC
carboxy groups
carboxylic acid groups
device fabrication
TiO 2 photoanode
TDDFT