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Rome, Italy

Barolo C.,University of Turin | Yum J.-H.,Ecole Polytechnique Federale de Lausanne | Artuso E.,University of Turin | Barbero N.,University of Turin | And 8 more authors.
ChemSusChem | Year: 2013

We report a facile synthetic route to obtain functionalized quaterpyridine ligand and its trans-dithiocyanato ruthenium complex, based on a microwave-assisted procedure. The ruthenium complex has been purified using a silica chromatographic column by protecting carboxylic acid groups as iso-butyl ester, which are subsequently hydrolyzed. The highly pure complex exhibits panchromatic response throughout the visible region. DFT/time-dependent DFT calculations have been performed on the ruthenium complex in solution and adsorbed onto TiO2 to analyze relative electronic and optical properties. The ruthenium complex endowed with the functionalized quaterpyridine ligand was used as a sensitizer in dye-sensitized solar cell yielding a short-circuit photocurrent density of more than 19mA cm-2 with a broad incident photon to current conversion efficiency spectra ranging from 400 to 900nm, exceeding 80 % at 700nm. Pure trans-Ru complexes for DSSCs: A facile synthetic route to obtain functionalized quaterpyridine ligand and its trans-dithiocyanato Ru complex, based on a microwave-assisted procedure, is presented. The highly pure complex exhibits panchromatic response throughout the visible region and shows a high overall photovoltaic conversion efficiency at standard AM1.5 sunlight, the best efficiency reported up to now for tetradentate ligand-based RuII dyes. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Park J.,University of Turin | Barolo C.,University of Turin | Sauvage F.,Ecole Polytechnique Federale de Lausanne | Sauvage F.,CNRS Laboratory of Chemistry and Reactivity of Solids | And 8 more authors.
Chemical Communications | Year: 2012

A symmetric squaraine and its related non-symmetric structure are shown to have comparable efficiencies in DSCs, but with undoubtedly advantages in the low cost and easiness of synthesis for the symmetrical structure. This journal is © The Royal Society of Chemistry 2012.

Mastroianni S.,University of Rome Tor Vergata | Lanuti A.,University of Rome Tor Vergata | Penna S.,DYEPOWER | Reale A.,University of Rome Tor Vergata | And 3 more authors.
ChemPhysChem | Year: 2012

A long-term life test (3200 h) on large-area dye-sensitized cells is performed both under outdoor conditions, in the sunny Mediterranean climate in Rome (Italy), and under continuous light soaking (1 Sun, 85 °C). Different degradation rates are investigated for the outdoor samples with horizontally and vertically oriented cells (azimuth South, tilt angle 25°). Thirty identical photocells (active area=3.6 cm 2, conversion efficiencies=(4. 8±0.2) %) are aged using a robust master-plate configuration. After the first 1000 h of testing in open-circuit conditions, some of the test samples are set near the maximum power point (MPP) and the life test continued further until 3200 h. A detailed analysis of the physical parameters obtained by electrochemical impedance is given together with electrolyte transmittance variation with time as a function of the ageing conditions. Faster degradation in devices working at the MPP is observed, due mainly to a progressive decrease of the triiodide concentration in the electrolyte and a likely alteration at the titania/electrolyte interface. Outdoor devices working with vertically oriented cells show clearly that the orientation of long-striped cells can affect the lifetime. The aged cells suffer an increase of recombination rate, change in the chemical capacitance, and positive shift of the titania conduction band level. A strong correlation between the increase of the electrolyte diffusion resistance and degradation phenomena is found. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

The present invention concerns a vertical electrical connection of photoelectrochemical cells, arranged side-by-side between two opposing substrates, at least one of which is transparent or semi-transparent, and covered, on the side facing towards the other substrate, by an electrically conductive coating divided into a plurality of side-by-side regions electrically isolated by means of a corresponding number of interruptions, said vertical electrical connection being arranged between an electrically isolated region of the electrically conductive coating of a substrate, in electric contact with a photoelectrochemical cell, and the electrically isolated region of the electrically conductive coating of the opposing substrate, in contact with an adjacent photoelectrochemical cell, characterized in that it is made of three overlapping portions, that is two portions, respectively coupled with the conductive coating of each of the two opposing substrates delimiting said photoelectrochemical cells.

A process of manufacturing the catalytic layer of the counter-electrodes of dye-sensitized solar cells is described. The process has the following steps: depositing a catalyst precursor paste or precursor solution layer over the counter-electrodes conductive and transparent substrates, by screen printing, doctor blade, spin coating or brush,and irradiating the catalyst precursor paste or precursor solution layer with a continuous wave or pulsed laser beam having a wavelength in the range of infrared, visible, or ultraviolet, thus curing the precursor and forming a catalyst layer over the conductive and transparent counter-electrode substrates.

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