Abstract
Isomeric Ru(ii) sensitizers, with varied steric impediment on TiO2, show high efficiency using Co2+/3+ electrolyte, with higher efficiency for the more symmetric isomers.
Highlights
Photovoltaic technologies are pivotal to the future progression of human societies, among which dye-sensitized solar cells (DSCs)[1] have already achieved a highest conversion efficiency of $13%, using Zn(II) porphyrin sensitizers together with Co2+/3+ electrolytes.[2]
The main function of the 2,6-dihexyloxylphenyl group is to provide both further increased p-conjugation on the whole molecule and tailored steric encumbrance over the thienyl fragment, such that the formation of intermolecular p–p-stacking interactions around the isoquinolinyl entities can be effectively suppressed. This knowledge is obtained from the molecular design of several efficient DSC sensitizers, on which similar 2,6dialkoxyphenyl groups were incorporated for suppressing aggregation, improving the solubility in organic solvents, and enhancing the overall efficiency of the fabricated DSC devices.[18]
We have designed and prepared a series of thiocyanate-free Ru(II) sensitizers, i.e. TFRS-80a, 80b and 80c, all with similar electrochemical properties and identical optical response under simulated one sun illumination, but showing varied steric impediment upon depositing on TiO2 surface according to the coordination orientation of the tpiq ancillaries
Summary
Photovoltaic technologies are pivotal to the future progression of human societies, among which dye-sensitized solar cells (DSCs)[1] have already achieved a highest conversion efficiency of $13%, using Zn(II) porphyrin sensitizers together with Co2+/3+ electrolytes.[2]. These sensitizers are derived from a p-conjugated tpiqH chelate, i.e. 6-(5-(2,6-bis(hexyloxy)phenyl)thiophen-2-yl)-1-(3-(tri uoromethyl)-1H-pyrazol-5-yl)isoquinoline, such that their higher absorptivity and potential for fabrication of DSCs with high h of 9.06% triggered the full determination of their photophysical and electrochemical properties and structure-efficiency relationship of both IÀ/I3À and Co2+/3+ based dye-sensitized solar cells (Scheme 2).
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