Listar por tema "Impedance spectroscopy"
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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 ... -
Advanced characterization of thermoelectric materials and devices by impedance spectroscopy
Universitat Jaume I (2020-11-10)Els dispositius termoelèctrics (TEs) poden convertir directament calor en electricitat o usar electricitat per crear una diferència de temperatura, no obstant això, actualment no estan molt estesos a causa de la seua baixa ... -
Carrier density and interfacial kinetics of mesoporous TiO2 in aqueous electrolyte determined by impedance spectroscopy
Elsevier (2012)Water splitting at a semiconductor/solution interface with the only input of sunlight to generate hydrogen is one of the most attractive strategies to produce and store chemical energy. In the present study we have ... -
Charge carrier mobility and lifetime of organic bulk heterojunctions analyzed by impedance spectroscopy
Elsevier (2008)Charge carrier diffusion and recombination in an absorber blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C<sub>61</sub>-butyric acid methyl ester (PCBM) with indium tin oxide (ITO) and aluminium contacts have been ... -
Consistent formulation of the crossover from density to velocity dependent recombination in organic solar cells
AIP Publishing (2015)Carrier recombination is a central process in bulk heterojunction organic solar cells. Based on the competition of hopping rates that either implies escape in a broad density of states or recombination across the interface, ... -
Degradation through Directional Self-Doping and Homogeneous Density of Recombination Centers Hindered by 1,8-Diiodooctane Additive in Non-Fullerene Organic Solar Cells
Wiley (2021-03-01)Non-fullerene-based organic solar cells (OSCs) have recently proven to perform with efficiencies above 18%. This is an important milestone for one of the most promising technologies in the fields of flexible and ... -
Design, Synthesis, and Characterization of New Generation Lithium Batteries
Universitat Jaume I (2019-06-26)In the last years, Li-ion batteries received great attention because of the increasing energetics requirements of modern society across a broad range of applications. We need to switch to renewable source energy and be ... -
Development and Characterization of Electro- and Photo-Electrochemical Systems for High-Added-Value Products
Universitat Jaume I (2023-05-04)The main challenge in the development of electrochemical and photoelectrochemical systems is the kinetics of the anodic oxygen evolution half-reaction (OER), which is intrinsically slow. For this reason, in this thesis all ... -
Development of perovskite optoelectronic devices on flexible substrates
Universitat Jaume I (2022-03-08)In this thesis, first, the monolithic integration of a perovskite-based optical waveguide amplifier together with a photodetector on a nanocellulose substrate is shown to demonstrate the feasibility of a stretchable signal ... -
Device Modelling of Perovskite Solar Cells using Small Perturbation Methods
Universitat Jaume I (2019-09-16)Perovskite solar cells (PSC) have emerged as an important player in the search for producing c1ean and renewable energy at high efficiencies. However, there exist several bottlenecks to maximise their efficiency and ... -
Discerning recombination mechanisms and ideality factors through impedance analysis of high-efficiency perovskite solar cells
Elsevier (2018)The ubiquitous hysteresis in the current-voltage characteristic of perovskite solar cells (PSCs) interferes in a proper determination of the diode ideality factor (n), a key parameter commonly adopted to analyze recombination ... -
Effect of the oxidation states on the electrical properties of Fe-doped Pr2Zr2O7 pyrochlore
Elsevier (2022-01-01)Pyrochlores with formula Pr2Zr2-xFexO7±d (x ¼ 0.00, 0.05, 0.10 and 0.15) were synthesized by the coprecipitation method. Pellets of these compositions sintered at 1400 C for 12 h were characterized by XRD, Rietveld ... -
Electrochemical valorization of HMF using Ni/Graphite electrodes
Elsevier (2024-01)The electrooxidation of 5-hydroxymethylfurfural (HMF) into 2,5- furandicarboxilic acid (FDCA) has been successfully accomplished using cost-effective NiO–OH electrodes, prepared through Ni electrodeposition on pencil ... -
Elucidating Operating Modes of Bulk-Heterojunction Solar Cells from Impedance Spectroscopy Analysis
American Chemical Society (2013)We discuss the progress and challenges in the application of impedance spectroscopy analysis to determine key processes and parameters in organic bulk-heterojunction solar cells. When carrier transport or outer interface ... -
Enhanced conductivity and nonlinear voltage–current characteristics of nonstoichiometric BaTiO3 ceramics
Wiley-Blackwell (2011-03-21)The electrical conductivity of both BaO-deficient and TiO2-deficient BaTiO3 ceramics shows nonohmic, low-field characteristics at temperatures >∼200°C in contrast to stoichiometric BaTiO3 for which the electrical conductivity ... -
Harnessing infrared photons for photoelectrochemical hydrogen generation. A PbS quantum dot based "quasi-artificial leaf"
American Chemical Society (2013)Hydrogen generation by using quantum dot (QD) based heterostructures has emerged as a promising strategy to develop artificial photosynthesis devices. In the present study, we sensitize mesoporous TiO2 electrodes with ... -
Hole conductivity and acceptor density of p-type CuGaO2 nanoparticles determined by impedance spectroscopy: The effect of Mg doping
Elsevier (2013)Delafossite materials like CuGaO2 have appeared as promising p-type semiconductor materials for their exploitation in tandem dye sensitized solar cells and water splitting photoelectrochemical cells. However, the intrinsic ... -
Hysteresis and Capacitive Features of Perovskite Solar Cells
Universitat Jaume I (2020-06-19)In the present work, anomalous distortions occurring in the current-voltage characteristic of perovskite solar cells (PSCs), usually called J-V curve hysteresis, are studied by several methods. This includes dynamic ... -
Hysteresis Control in Hybrid Perovskite-based Devices for Photovoltaic and Neuromorphic Computing Applications
Universitat Jaume I (2023-07-07)Perovskite solar cells have been rapidly advancing in record efficiencies at an unprecedented rate already approaching the theoretical maximum efficiency in just over a decade of development. Most notably, perovskites ... -
LiFePO4 particle conductive composite strategies for improving cathode rate capability
Elsevier (2015-05)Lithium iron phosphate (LFP) cathodes are one of the most promising candidates to find application in hybrid electric vehicle energy storage system. For this reason advances in the performance of its theoretical capacity ...