Listar FCA_Articles por fecha de publicación
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Excitons diffusion and singlet-triplet occupation at high Bose-Einstein chemical potential
Elsevier (2008)The paper investigates the bosonic aspects of exciton statistics in non-equilibrium situations. A kinetic model is formulated treating the excitons in different states as chemical species, using a master equation consistent ... -
Beyond the quasistatic approximation: Impedance and capacitance of an exponential distribution of traps
American Physical Society (2008)Electronic carriers in disordered organic and inorganic semiconductor materials, used in electronic, optoelectronic, and photovoltaic devices, are usually affected by an exponential distribution of localized states in the ... -
Dielectric losses measured in a sodium aluminosilicate glass by using electrical insulating barriers and non-isothermal experimental conditions
Elsevier (2008)Ac conductivity and dielectric losses are measured on a sodium aluminosilicate glass using various experimental conditions. Data obtained using metallic contacts and insulating barriers are compared. The influences of the ... -
Band unpinning and photovoltaic model for P3HT:PCBM organic bulk heterojunctions under illumination
Elsevier (2008)Capacitance analysis of P3HT:PCBM bulk heterojunction solar cells, in dark and under illumination, shows a linear Mott-Schottky characteristic at moderate reverse bias, indicating p-doping of the organic blend. The flatband ... -
Physical electrochemistry of nanostructured devices
Royal Society of Chemistry (2008)This Perspective reviews recent developments in experimental techniques and conceptual methods applied to the electrochemical properties of metal-oxide semiconductor nanostructures and organic conductors, such as those ... -
Use of polar decomposition of Mueller matrices for optimizing the phase response of a liquid-crystal- on-silicon display
Optical Society of America (2008)We provide experimental measurement of the Mueller matrices corresponding to an on-state liquid-crystal-on-silicon display as a function of the addressed voltage. The polar decomposition of the Mueller matrices determines ... -
Spatial-chirp compensation in dynamical holograms reconstructed with ultrafast lasers
American Institute of Physics (2008)A computer generated hologram (CGH) reconstructed with a sub-100-fs laser pulse at the focal plane of a conventional refractive lens experiences a large amount of spatial chirp. We report the shaping of a 12 fs laser pulsed ... -
Spectral analysis of femtosecond pulse diffraction through binary diffractive optical elements: theory and experiment
Optical Society of America (2008)We report on the changes in the spectrum of a femtosecond pulse originated by diffraction of the ultrashort waveform through a circularly symmetric binary diffractive optical element. The analysis is performed in the ... -
20 GHz arbitrary radio-frequency waveform generator based on incoherent pulse shaping
Optical Society of America (2008)We demonstrate a new approach of photonically assisted radiofrequency (RF) waveform generation using a spectrally incoherent light source. The system is based on the so-called generalized frequency-to-time mapping ... -
Reconfigurable RF-Waveform Generation Based on Incoherent-Filter Design
Institute of Electrical and Electronics Engineers (2008)Radio-frequency (RF) waveform generators are key devices for a variety of applications, including radar, ultra-wideband communications, and electronic test measurements. Following advances in broadband coherent pulsed ... -
Lossless equalization of frequency combs
Optical Society of America (2008)Frequency combs obtained by sinusoidal phase modulation of narrow-band continuous-wave lasers are widely used in the field of optical communications. However, the resulting spectral envelope of the comb is not at. ... -
Ghost interference with classical partially coherent light pulses
American Physical Society (2008)The two-photon temporal coincidence detection amplitude obeys a pair of equations identical to those of classical partially coherent plane-wave pulses propagating in linearly dispersive media. These equations are also ... -
Electrodeposition and impedance spectroscopy characterization of ZnO nanowire arrays
Wiley-Blackwell (2008)An overview of the electrodeposition of ZnO nanowire arrays from the reduction of dissolved molecular oxygen in zinc chloride solutions was reported. In spite of the internal structure of ZnO which favours the anisotropic ... -
Recombination rates in heterojunction silicon solar cells analyzed by impedance spectroscopy at forward bias and under illumination
Elsevier (2008)Impedance spectroscopy (at forward bias and under illumination) of solar cells comprised thin hydrogenated amorphous silicon (a-Si:H) films deposited on crystalline silicon (c-Si) wafers was analyzed in terms of ac equivalent ... -
Influence of the Potassium Chloride Concentration on the Physical Properties of Electrodeposited ZnO Nanowire Arrays
American Chemical Society (2008)The structural, electrical, and optical properties of zinc oxide nanowire arrays electrodeposited from the reduction of molecular oxygen in aqueous solutions containing zinc chloride and potassium chloride are studied as ... -
A review of recent results on electrochemical determination of the density of electronic states of nanostructured metal-oxide semiconductors and organic hole conductors
Elsevier (2008)The paper reviews recent results on electrochemical methods applied to the determination of the density of electronic states in several components of advanced nanostructured devices such as the dye solar cell (Grätzel ... -
Large improvement of electron extraction from CdSe quantum dots into a TiO<sub>2</sub> thin layer by N3 dye coabsorption
Elsevier (2008)Extraction of electrons and holes photogenerated in CdSe quantum dots (QD) of 2.3 nm diameter, is monitored by Surface Photovoltage Spectroscopy. The extraction of electrons into a thin TiO<sub>2</sub> layer increases ... -
Interpretation of diffusion coefficients in nanostructured materials from random walk numerical simulation
Royal Society of Chemistry (2008)We make use of the numerical simulation random walk (RWNS) method to compute the ‘‘jump’’ diffusion coefficient of electrons in nanostructured materials via mean-square displacement. First, a summary of analytical results ... -
Fiber transmission and generation of ultrawideband pulses by direct current modulation of semiconductor lasers and chirp-to-intensity conversion
Optical Society of America (2008-02-01)Optical pulses generated by current modulation of semiconductor lasers are strongly frequency chirped. This effect has been considered pernicious for optical communications. We take advantage of this effect for the generation ... -
Segmental dynamics in poly(ε-caprolactone)/poly(L-lactide) copolymer networks
Wiley (2009)Poly(ε-caprolactone) (PCL) and poly(lactic acid) (PLA) networks were prepared from macromonomer diols functionalized with methacrylic anhydride, which allows one to get self-crosslinkable polymers. Besides, both macromonomers ...