A5053820052- Conducting polymers and applications
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Perovskite Materials and Applications
- Organic Electronics and Photovoltaics
- Quantum Dots Synthesis And Properties
- Porphyrin and Phthalocyanine Chemistry
- Chalcogenide Semiconductor Thin Films
- Molecular Junctions and Nanostructures
- Organic Light-Emitting Diodes Research
- CO2 Reduction Techniques and Catalysts
- Molecular Sensors and Ion Detection
- Electrochemical Analysis and Applications
- Photochemistry and Electron Transfer Studies
- Analytical Chemistry and Sensors
- Electrocatalysts for Energy Conversion
- Polyoxometalates: Synthesis and Applications
- Thin-Film Transistor Technologies
- Luminescence and Fluorescent Materials
- Copper-based nanomaterials and applications
- Catalytic Processes in Materials Science
- Advanced biosensing and bioanalysis techniques
- Radical Photochemical Reactions
- Transition Metal Oxide Nanomaterials
- Fullerene Chemistry and Applications
Institut Català d'Investigació Química
2016-2025
Institució Catalana de Recerca i Estudis Avançats
2016-2025
Imperial College London
2002-2024
Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux
2022-2024
Université de Pau et des Pays de l'Adour
2023-2024
Centre National de la Recherche Scientifique
2023-2024
National Renewable Energy Laboratory
2024
University of Colorado Boulder
2024
Leibniz-Institute for New Materials
2024
Environmental Energy & Engineering
2024
We report herein a methodology for conformally coating nanocrystalline TiO2 films with thin overlayer of second metal oxide. SiO2, Al2O3, and ZrO2 overlayers were fabricated by dipping mesoporous, in organic solutions their respective alkoxides, followed sintering at 435 degrees C. These three oxide are shown all cases to act as barrier layers interfacial electron transfer processes. However, experimental measurements film density charge recombination dynamics under applied negative bias...
In this work, we study the characteristics of dye-sensitized solar cells using an ionic liquid as electrolyte and compare them with response a solvent-containing cell. Impedance spectroscopy is used to derive key circuit elements determining photovoltaic performance On basis data, photocurrent voltage curves are calculated compared experimental results.
Abstract This paper presents an overview of the research carried out by a European consortium with aim to develop and test new improved ways realise dye‐sensitized solar cells (DSC) enhanced efficiencies stabilities. Several areas have been explored in field concepts materials, fabrication protocols for TiO 2 scatterlayers, metal oxide blocking layers, strategies co‐sensitization low temperature processes platinum deposition. Fundamental understanding working principles has gained means...
Dyeing together: An efficient panchromatic dye-sensitized solar cell is constructed by using a “molecular cocktail” composed of an organic dye and zinc phthalocyanine (see picture). The use multiple, complementary dyes (cosensitization) important step towards cells that operate across the full spectrum irradiation. Supporting information for this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z703106_s.pdf or from author. Please note: publisher not responsible...
In this paper we focus upon the electron injection dynamics in complete dye-sensitized nanocrystalline metal oxide solar cells (DSSCs). Electron are studied by transient absorption and emission studies of DSSCs correlated with device photovoltaic performance charge recombination dynamics. We find that dependent composition redox electrolyte employed device. a an yielding optimum efficiency, kinetics exhibit half time 150 ps. This is 20 times slower than for control films covered inert...
We report a comparison of charge transport and recombination dynamics in dye-sensitized solar cells (DSSCs) employing nanocrystalline TiO2 SnO2 films address the impact these upon photovoltaic device efficiency. Transient photovoltage studies electron metal oxide film are correlated with transient absorption both oxidized sensitizer dyes redox couple. For all three processes, observed to be 2−3 orders magnitude faster for electrode. The origins addressed by correlating dye cations...
In order to increase the energy efficiency of dye-sensitized solar cells beyond 10%, an improved dye needs be developed with greater light absorption in red and near-infrared. Many dyes have been tested for this purpose; however, no significant 750 nm has functioned properly. We examined a series ruthenium phthalocyanines, class large tunable red. For these we observe reduction output voltage relative benchmark (N719). By examination photovoltage transients charge density measurements,...
Methylammonium lead iodide (MAPI) cells of the design FTO/sTiO2/mpTiO2/MAPI/Spiro-OMeTAD/Au, where FTO is fluorine-doped tin oxide, sTiO2 indicates solid-TiO2, and mpTiO2 mesoporous TiO2, are studied using transient photovoltage (TPV), differential capacitance, charge extraction, current interrupt, chronophotoamperometry. We show that in mpTiO2/MAPI there two kinds extractable stored under operation: a capacitive electronic (∼0.2 μC/cm2) another, larger (40 μC/cm2), possibly related to...
Among the new photovoltaic technologies, Dye-Sensitized Solar Cell (DSC) is becoming a realistic approach towards energy markets such as BIPV (Building Integrated PhotoVoltaics). In order to improve performances of DSCs and increase their commercial attractiveness, cheap, colourful, stable highly efficient ruthenium-free dyes must be developed. Here we report synthesis complete characterization purely organic sensitizer (RK1) that can prepared synthetically upscaled rapidly. cells containing...
We have designed and synthesised two new carbazole based self-assembled molecules as hole-selective layers (HSLs) in p–i–n perovskite solar cells achieving high efficiency stability.
An overview of the advantages and challenges photocatalytic water splitting is provided to encourage new research directions mainly on data reproducibility photocatalyst scalability.
Abstract Due to their outstanding optoelectronic properties, lead-based halide perovskite materials have been applied as efficient photoactive in solution-processed solar cells. Current record efficiencies offer the promise surpass those of silicon However, uncertainty about potential toxicity and facile dissolution water requires a search for new alternative perovskite-like materials. Thanks foresight scientists experience preparation, remarkable results obtained short period time using...
In this paper we address the dependence of charge recombination dynamics in dye-sensitized, nanocrystalline TiO2 films upon properties sensitizer dye employed. particular focus kinetics oxidation potential E0(D+/D), determined electrochemically, and spatial separation r cation HOMO orbital from metal oxide surface, by semiempirical calculations. Our studies employed a series ruthenium bipyridyl dyes addition to porphyrin phthalocyanine dyes. A strong correlation is observed between r, with...
The selectivity and sensitivity of two colorimetric sensors based on the ruthenium complexes N719 [bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) bis(tetrabutylammonium) bis(thiocyanate)] N749 [(2,2':6',2' '-terpyridine-4,4',4' '-tricarboxylate)ruthenium(II) tris(tetrabutylammonium) tris(isothiocyanate)] are described. It was found that mercury ions coordinate reversibly to sulfur atom dyes' NCS groups. This interaction induces a color change in dyes at submicromolar concentrations...
Solid-state dye-sensitized solar cells of the type TiO2/dye/CuSCN have been made with thin Al2O3 barriers between TiO2 and dye. The Al2O3-treated show improved voltages fill factors but lower short-circuit currents. Transient photovoltage photocurrent measurements used to find pseudo-first-order recombination rate constant (kpfo) capacitance as a function potential. Results that kpfo is dependent on Voc same form in TiO2/dye/electrolyte cells. added layer acts "tunnel barrier", reducing thus...
We report a transient absorption study of the kinetics re-reduction ruthenium bipyridyl dye cations adsorbed to nanocrystalline TiO2 films by iodide ions, employing series RuII(dcbpy)2X dyes, where dcpby = 4,4'-dicarboxy-2,2'-bipyridyl and X (NCS)2, (CN)2, DTC (diethyldithiocarbamate), Cl2. The data indicate that this (or 'regeneration') reaction proceeds via (dye+−iodide) intermediate complex formed photogenerated with one ion. subsequent second ion, forming I2-, is shown be kinetically...
The conformal growth of an overlayer Al2O3 on a nanocrystalline TiO2 film is shown to result in 4-fold retardation interfacial charge recombination, and 30% improvement photovoltaic device efficiency.
A trial separation: dye-sensitized nanocrystalline TiO2 film (see scheme) is prepared in which a remarkably long-lived (4 s) charge-separated state can be generated. The key parameter that controls charge transfer at the dye/TiO2 interface shown to spatial separation between cation center of dye and electrode surface. Supporting information for this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z500363_s.pdf or from author. Please note: publisher not...
A [Ru(dcbpy)(2)(NCS)(2)] dye has been chemically modified by the addition of a secondary electron donor moiety, N,N-(di-p-anisylamino)phenoxymethyl. Optical excitation adsorbed to nanocrystalline TiO(2) films shows remarkably long-lived charge-separated state, with decay half time 0.7 s. Semiempirical calculations confirm that HOMO molecule is localised on group. The retardation recombination dynamics relative unmodified control caused increase in spatial separation orbital from surface....
A novel ligand 4,4'-bis(carboxyvinyl)-2,2'-bipyridine (L) and its ruthenium(II) complex [Ru(II)L(2)(NCS)(2)] (K8) were synthesized characterized by analytical, spectroscopic, electrochemical techniques. The performance of the K8 as a charge transfer photosensitizer in nanocrystalline TiO(2) based solar cells was studied. When anchored onto film, we achieved very efficient sensitization yielding 77 +/-5% incident photon-to-current efficiencies (IPCE) visible region using an electrolyte...
We investigate the effect of a thin alumina coating nanocrystalline TiO2 films on recombination dynamics dye-sensitized solar cells. Both coated and uncoated cells were measured by combination techniques: transient absorption spectroscopy, electrochemical impedance open-circuit voltage decay. It is found that barrier reduces photoinjected electrons to both dye cations oxidized redox couple. proposed this observed retardation can be attributed primarily two effects: almost complete...
Abstract Let it shine! The impact of the anchoring group on photovoltaic performance by a series phthalocyanine sensitisers (see figure) has been demonstrated. magnified image A unsymmetrical zinc phthalocyanines bearing an carboxylic function linked to ring through different spacers were designed for dye‐sensitised solar cells (DSSC). modification spacer allows not only variable distance between dye and nanocrystalline TiO 2 , but also distinct orientation semiconductor surface. data show...