Projects per year
To supplement our study on thiocyanate-free ruthenium sensitizers (TFRS) for dye-sensitized solar cells (DSSCs), which belong to a class of Ru-based complexes coordinated by a single 4,4'-dicarboxylic acid-2,2'-bipyridine and two symmetrically arranged functionalized trans-azolate chelates, we carefully isolated and characterized the second and less-abundant stereoisomer, in which the two pyridyl azolate ancillaries are asymetrically cis-arranged to each other. Two distinctive ancillaries, namely: 5-[4-(5-hexyl-2-thienyl)-2-pyridinyl]-3-trifluoromethyl pyrazole and 5-(6-tert-butyl-1-isoquinolinyl)-3-trifluoromethyl pyrazole, were employed in this study, giving a total of four sensitizers, that is, thienyl substituted TFRS-2a and 2b, and isoquinolinyl substituted TFRS-52a and 52b, in which the suffix b indicates the cis-stereoisomers. To gain insight into their fundamental properties their photophysical, electrochemical, and spectroelectrochemical behavior was investigated by density functional theory. Upon comparison of the correspondingly fabricated DSSCs, the sensitizers TFRS-2a and 52a yielded significantly higher conversion efficiencies than their asymmetrical cis-counterparts, TFRS-2b and 52b. To rationalize the cell performances charge extraction/photovoltage decay and impedance spectroscopic measurements were carried out to compare the rates of interfacial electron recombination from the TiO conduction band to the electrolyte.
FingerprintDive into the research topics of 'Geometrical Isomerism of Ru Dye-Sensitized Solar Cell Sensitizers and Effects on Photophysical Properties and Device Performances'. Together they form a unique fingerprint.
- 3 Finished
1/04/12 → 31/03/13
1/10/10 → 22/04/14