Listar FCA_Articles por fecha de publicación
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Impedance spectroscopy characterisation of highly efficient silicon solar cells under different light illumination intensities
Royal Society of Chemistry (2009)Highly efficient silicon solar cells have been characterised by impedance spectroscopy and current–potential characteristic in the dark and with different illumination intensities. For each illumination the impedance ... -
Random walk numerical simulation for hopping transport at finite carrier concentrations: diffusion coefficient and transport energy concept
Royal Society of Chemistry (2009)The random walk numerical simulation (RWNS) method is used to compute diffusion coefficients for hopping transport in a fully disordered medium at finite carrier concentrations. We use Miller–Abrahams jumping rates and ... -
Optical filters with fractal transmission spectra based on diffractive optics
Optical Society of America (2009)The duality between the axial irradiance distribution originated by any circularly symmetric diffracting aperture under monochromatic illumination and its diffracted spectral intensity at a fixed on-axis point under broadband ... -
Poincaré-sphere representation of phase-mostly twisted nematic liquid crystal spatial light modulators
Institute of Physics (2009)We establish necessary conditions in order to design a phase-only wave front modulation system from a liquid crystal display. These conditions determine the dependence of the polarization state of the light emerging from ... -
Phase calibration of spatial light modulators by means of Fresnel images
Institute of Physics (2009)Reliable application of spatial light modulators (SLMs) as programmable diffractive optical elements requires a thorough calibration. In this paper, we propose a method for calibrating SLMs based on the evaluation of ... -
Kinetics of interface state-limited hole injection in α-naphthylphenylbiphenyl diamine (α-NPD) thin layers
Elsevier (2009)Injection-limited operation is identified in thin-film, α-NPD-based diodes. A detailed model for the impedance of the injection process is provided which considers the kinetics of filling/releasing of interface states as ... -
Recombination in Quantum Dot Sensitized Solar Cells
American Chemical Society (2009-11)Quantum dot sensitized solar cells (QDSCs) have attracted significant attention as promising third-generation photovoltaic devices. In the form of quantum dots (QDs), the semiconductor sensitizers have very useful and often ... -
Doping-induced broadening of the hole density-of-states in conducting polymers
Elsevier (2010)The density-of-states distribution in conducting polymers reflects the energy disorder caused by electrostatic and steric interactions resulting from the different environment in which each molecule is placed. In case of ... -
Influence of cysteine adsorption on the performance of CdSe quantum dots sensitized solar cells
Elsevier (2010)The surface of mesoporous TiO<sub>2</sub> electrodes has been functionalized with cysteine using different solutions for the subsequent attachment of colloidal CdSe QDs solved in toluene. The adsorption behavior of both ... -
Determination of charge carrier mobility of hole transporting polytriarylamine-based diodes
Elsevier (2010)Hole transport properties of three different side chain poly(triarylamines) have been determined by means of the analysis of steady-state current-voltage characteristics using co-planar diode structures. The interpretation ... -
Temperature dependence of open-circuit voltage in organic solar cells from generation-recombination kinetic balance
Elsevier (2010)The variation in the open-circuit voltage of bulk-heterojunction organic solar cells with temperature and light intensity is analyzed based on the kinetic balance between photogeneration and recombination rates, by determining ... -
Simultaneous determination of carrier lifetime and electron density-of-states in P3HT:PCBM organic solar cells under illumination by impedance spectroscopy
Elsevier (2010)We report new insights into recombination kinetics in poly(3-hexylthiophene):methanofullerene (P3HT:PCBM) bulk heterojunction (BHJ) solar cells, based on simultaneous determination of the density of states (DOS), internal ... -
Theory of the impedance of charge transfer via surface states in dye-sensitized solar cells
Elsevier (2010)The dynamics of trapping coupled with charge transfer is analysed in the frequency domain for a model of the dye-sensitized solar cell. We solve the steady state occupations of the surface state and the resulting recombination ... -
Influence of solvent on the network structure formed by free radical polymerization of tri-ethylene glycol dimethacrylate: A dielectric study
Elsevier (2010)Molecular mobility of a series of tri-ethylene glycol dimethacrylate (TrEGDMA) samples polymerized with different amounts of ethyl acetate up to 40% (w/w) as diluent was investigated by dielectric relaxation spectroscopy. ... -
From Salts to Ionic Liquids by Systematic Structural Modifications: A Rational Approach Towards the Efficient Modular Synthesis of Enantiopure Imidazolium Salts
Wiley-VCH (2010)This paper reports a simple and robust modular synthetic strategy that leads to a large variety of configurationally and structurally diverse imidazole-based chiral ionic liquids (CILs) by lipase-catalyzed resolution. The ... -
Structural diversity in the self-assembly of pseudopeptidic macrocycles
Wiley-VCH (2010)The self-assembling abilities of several pseudopeptidic macrocycles have been thoroughly studied both in the solid (SEM, TEM, FTIR) and in solution (NMR, UV, CD, FTIR) states. Detailed microscopy revealed large differences ... -
Divalent cations reduce the pH sensitivity of OmpF channel inducing the pKa shift of key acidic residues
RSC Publishing (2010-11-03)In contrast to the highly-selective channels of neurophysiology employing mostly the exclusion mechanism, different factors account for the selectivity of large channels. Elucidation of these factors is essential for ... -
Dilemmas of dye-sensitized solar cells
Wiley-VCH Verlag Berlin (2011)Ferrocene to the rescue: The dye-sensitized solar cell allows changes in the energetics of electron transport, molecular absorbers, and hole transport materials to better harvest the energy of solar photons (see picture). ... -
Triplication of the photocurrent in dye solar cells by increasing the elongation of the π-conjugation in Zn-porphyrin sensitizers
Wiley-VCH Verlag Berlin (2011)Porphyrins are promising sensitizers for dye solar cells (DSCs) but narrow absorption bands at 400-450 and 500-650 nm limit their light-harvesting properties. Increasing elongation of the π-conjugation and loss of symmetry ... -
Molecular dynamics simulations of concentrated aqueous electrolyte solutions
Taylor & Francis (2011)Transport properties of concentrated electrolytes have been analysed using classical molecular dynamics simulations with the algorithms and parameters typical of simulations describing complex electrokinetic phenomena. ...