Listar por autoría "ef941584-f910-4cea-89fc-b10690d6dc3f"
Mostrando ítems 1-20 de 127
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A high-capacity Li[Ni0.8Co0.06Mn0.14]O2 positive electrode with a dual concentration gradient for next-generation lithium-ion batteries
Park, Kang-Joon; Lim, Byung-Beom; Choi, Moon-Ho; Jung, Hun-Gi; Sun, Yang-Kook; Haro, Marta; Vicente-Agut, Nuria; Bisquert, Juan; Garcia-Belmonte, Germà Royal Society of Chemistry (2015-09)To increase the reversible capacity of layered lithium nickel-cobalt-manganese oxide, a Li[Ni0.8Co0.06Mn0.14]O2 positive electrode with a two-sloped full concentration gradient (TSFCG) was successfully synthesized via ... -
A review of recent results on electrochemical determination of the density of electronic states of nanostructured metal-oxide semiconductors and organic hole conductors
Bisquert, Juan; Fabregat-Santiago, Francisco; Mora-Sero, Ivan; Garcia-Belmonte, Germà; Barea, Eva M; Palomares, Emilio 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 ... -
All solution processed low turn-on voltage near infrared LEDs based on core–shell PbS–CdS quantum dots with inverted device structure
S. Sánchez, Rafael; Binetti, Enrico; Torre, J. A.; Garcia-Belmonte, Germà; Striccoli, Marinella; Mora-Sero, Ivan Royal Society of Chemistry (2014)Colloidal semiconductor quantum dots (QDs) are extraordinarily appealing for the development of light emitting devices (LEDs) due to tunable and pure color emission, brightness and solution processability. This last advantage ... -
Amorphous Iron Oxyhydroxide Nanosheets: Synthesis, Li Storage, and Conversion Reaction Kinetics
Xu, Chen; Zeng, Yi; Rui, Xianhong; Zhu, Jixin; Tan, Huiteng; Guerrero, Antonio; Toribio, Juan; Bisquert, Juan; Garcia-Belmonte, Germà; Yan, Qingyu American Chemical Society (2013)We present a facile approach to synthesize amorphous iron oxyhydroxide nanosheet from the surfactant-assisted oxidation of iron sulfide nanosheet. The amorphous iron oxyhydroxide nanosheet is porous and has a high surface ... -
Analysis of the Hysteresis Behavior of Perovskite Solar Cells with Interfacial Fullerene Self-Assembled Monolayers
Vallés Pelarda, Marta; Clasen Hames, Bruno; García-Benito, Inés; Almora Rodríguez, Osbel; Molina-Ontoria, Agustín; S. Sánchez, Rafael; Garcia-Belmonte, Germà; Martín, Nazario; Mora-Sero, Ivan American Chemical Society (2016-10)The use of self-assembled monolayers (SAMs) of fullerene derivatives reduces the hysteresis of perovskite solar cells (PSCs). We have investigated three different fullerene derivatives observing a decrease on hysteresis ... -
Analytical model for light modulating impedance spectroscopy (LIMIS) in all-solid-state p-n junction solar cells at open-circuit
Almora Rodríguez, Osbel; Miravet, Daniel; Matt, Gebhard J.; Garcia-Belmonte, Germà; Brabec, Christoph J. American Institute of Physics (2010-01-02)Potentiostatic impedance spectroscopy (IS) is a well-known tool for characterization of materials and electronic devices. It can be complemented by numerical simulation strategies relying on drift-diffusion equations without ... -
Ballistic-like space-charge-limited currents in halide perovskites at room temperature
Almora Rodríguez, Osbel; Miravet, Daniel; García-Batlle, Marisé; Garcia-Belmonte, Germà American Institute of Physics (2021-12-13)The emergence of halide perovskites in photovoltaics has diversified the research on this material family and extended their application toward several fields in the optoelectronics, such as photo- and ionizing-radiation ... -
Band unpinning and photovoltaic model for P3HT:PCBM organic bulk heterojunctions under illumination
Bisquert, Juan; Garcia-Belmonte, Germà; Munar, Antoni; Sessolo, Michele; Soriano, Alejandra; Bolink, Henk J. 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 ... -
Capacitance, spectroelectrochemistry and conductivity of polarons and bipolarons in a polydicarbazole based conducting polymer
Pomerantz, Zvika; Zaban, Arie; Ghosh, Sankar; Lellouche, Jean-Paul; Garcia-Belmonte, Germà; Bisquert, Juan Elsevier (2008)The paper discusses the interpretation of electrochemical and spectroelectrochemical measurement of charging and transport of electronic species in conducting polymers, as a function of the polymer potential. The charging ... -
Capacitive dark currents, hysteresis, and electrode polarization in lead halide perovskite solar cells
Almora Rodríguez, Osbel; Zarazúa, Isaac; Mas, Elena; Mora-Sero, Ivan; Bisquert, Juan; Garcia-Belmonte, Germà American Chemical Society (2015-04)Despite spectacular advances in conversion efficiency of perovskite solar cell many aspects of its operating modes are still poorly understood. Capacitance constitutes a key parameter to explore which mechanisms control ... -
Carrier recombination flux in bulk heterojunction polymer: fullerene solar cells: Effect of energy disorder on ideality factor
Garcia-Belmonte, Germà Elsevier (2013-01)Energy disorder reduces the achievable open-circuit voltage in organic bulk-heterojunction solar cells. Here the effect of disorder on charge carrier recombination flux is numerically modeled. The recombination current ... -
Carrier recombination losses in inverted polymer: Fullerene solar cells with ZnO hole-blocking layer from transient photovoltage and impedance spectroscopy techniques.
Garcia-Belmonte, Germà; Pérez Boix, Pablo; Ajuria, Jon; Palacios, Roberto © 2011 American Institute of Physics (2011-04)In this study, full coincidence between impedance spectroscopy and transient photovoltage techniques in measuring recombination kinetics of photogenerated charge carriers in inverted polymer:fullerene organic solar cells ... -
Characterization of nanostructured hybrid and organic solar cells by impedance spectroscopy
Bisquert, Juan; Fabregat-Santiago, Francisco; Garcia-Belmonte, Germà; Mora-Sero, Ivan RSC Publishing (2011-04-06)We review the application of impedance spectroscopy in dye-sensitized solar cells, quantum dot-sensitized solar cells and organic bulk heterojunction solar cells. We emphasize the interpretation of the impedance parameters ... -
Charge carrier mobility and lifetime of organic bulk heterojunctions analyzed by impedance spectroscopy
Garcia-Belmonte, Germà; Munar, Antoni; Barea, Eva M; Bisquert, Juan; Ugarte, Irati; Pacios, Roberto 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 ... -
Charge carrier transport and contact selectivity limit the operation of PTB7-based organic solar cells of varying active layer thickness
Guerrero, Antonio; Montcada, Núria F.; Ajuria, Jon; Etxebarria, Ikerne; Pacios, Roberto; Garcia-Belmonte, Germà; Palomares, Emilio Royal Society of Chemistry (2013-08)In this work we study the different electrical loss pathways occurring during the operation of bulk heterojunction solar cells by using a variety of electrical and optical characterization techniques beyond the current ... -
Charge separation at disordered semiconductor heterojunctions from random walk numerical simulations
Mandujano-Ramírez, Humberto J.; González Vázquez, J. P.; Oskam, Gerko; Dittrich, Thomas; Garcia-Belmonte, Germà; Mora-Sero, Ivan; Bisquert, Juan; Anta, Juan A. Royal Society of Chemistry (2014)Many recent advances in novel solar cell technologies are based on charge separation in disordered semiconductor heterojunctions. In this work we use the Random Walk Numerical Simulation (RWNS) method to model the dynamics ... -
Classification of solar cells according to mechanisms of charge separation and charge collection
Kirchartz, Thomas; Bisquert, Juan; Mora-Sero, Ivan; Garcia-Belmonte, Germà Royal Society of Chemistry (2015)In the last decade, photovoltaics (PV) has experienced an important transformation. Traditional solar cells formed by compact semiconductor layers have been joined by new kinds of cells that are constituted by a complex ... -
Consistent formulation of the crossover from density to velocity dependent recombination in organic solar cells
Ansari-Rad, Mehdi; Garcia-Belmonte, Germà; Bisquert, Juan 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, ... -
Coupling between Ion Drift and Kinetics of Electronic Current Transients in MAPbBr3 Single Crystals
García-Batlle, Marisé; Mayén Guillén, Javier; Chapran, Marian; Baussens, Oriane; Zaccaro, Julien; Verilhac, Jean‐Marie; Gros-Daillon, Eric; Guerrero, Antonio; Almora Rodríguez, Osbel; Garcia-Belmonte, Germà American Chemical Society (2022-03-11)The optoelectronic properties of halide perovskite materials have fostered their utilization in many applications. Unravelling their working mechanisms remains challenging because of their mixed ionic–electronic conductive ... -
Current-voltage characteristics of bulk heterojunction organic solar cells: connection between light and dark curves
Pérez Boix, Pablo; Guerrero, Antonio; Marchesi, Luis F.; Garcia-Belmonte, Germà; Bisquert, Juan Wiley (2011-11)A connection is established between recombination and series resistances extracted from impedance spectroscopy and current-voltage curves of polythiophene:fullerene organic solar cells. Recombination is shown to depend ...