Listar Departament: Física por autoría "ef941584-f910-4cea-89fc-b10690d6dc3f"
Mostrando ítems 41-60 de 94
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Inverted Solution Processable OLEDs Using a Metal Oxide as an Electron Injection Contact
Barea, Eva M; Bolink, Henk J.; Coronado, Eugenio; Repetto, Diego; Sessolo, Michele; Bisquert, Juan; Garcia-Belmonte, Germà; Procházka, Jan; Kavan, Ladislav Wiley-Blackwell (2008)A new type of bottom-emission electroluminescent device is described in which a metal oxide is used as the electron-injecting contact. The preparation of such a device is simple. It consists of the deposition of a thin ... -
Inverted vs Standard PTB7:PC70BM Organic Photovoltaic Devices. The benefit of highly selective and extracting contacts in device performance
Etxebarria, Ikerne; Guerrero, Antonio; Albero, Josep; Garcia-Belmonte, Germà; Palomares, Emilio; Pacios, Roberto Elsevier (2014)In this work we compare the photovoltaic performance of different cell designs, standard and inverted, for one of the most promising systems to achieve power conversion efficiencies over 10% in polymer:fullerene single ... -
Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3
Almora Rodríguez, Osbel; González Lezcano, Alfredo; Guerrero, Antonio; Brabec, Christoph J.; Garcia-Belmonte, Germà American Institute of Physics (2020-08-18)Methylammonium lead iodide (CH3NH3PbI3) is one of the most attractive materials for optoelectronic applications, and it is the most typical absorber in perovskite solar cells, which are unprecedentedly successful devices ... -
Ionic charging by local imbalance at interfaces in hybrid lead halide perovskites
Almora Rodríguez, Osbel; Guerrero, Antonio; Garcia-Belmonte, Germà AIP Publishing (2016)Identification of specific operating mechanisms becomes particularly challenging when mixed ionic-electronic conductors are used in optoelectronic devices. Ionic effects in perovskitesolar cells are believed to distort ... -
Ionic Dipolar Switching Hinders Charge Collection in Perovskite Solar Cells with Normal and Inverted Hysteresis
Almora Rodríguez, Osbel; López Varo, Pilar; Taek Cho, Kyung; Aghazada, Sadig; Meng, Wei; Hou, Yi; Echeverría-Arrondo, Carlos; Zimmermann, Iwan; Matt, Gebhard J.; Jiménez Tejada, Juan Antonio; Brabec, Christoph J.; Nazeeruddin, Mohammad Khaja; Garcia-Belmonte, Germà Elsevier (2019-06-15)Drift-diffusion modeling of the ionic dipole switching from the measurement of fast scanned and long pre-biased electrical response is proposed as a novel protocol for evaluation of limit hysteretic effects in perovskite ... -
Ionic Reactivity at Contacts and Aging of Methylammonium Lead Triiodide Perovskite Solar Cells
Carrillo, Jordi; Guerrero, Antonio; Rahimnejad, Sara; Almora Rodríguez, Osbel; Zarazúa, Isaac; Mas, Elena; Bisquert, Juan; Garcia-Belmonte, Germà Wiley (2016-02)Hybrid lead halide perovskites have reached very large solar to electricity power conversion efficiencies, in some cases exceeding 20%. The most extensively used perovskite-based solar cell configuration comprises CH3NH3PbI3 ... -
Kinetics of interface state-limited hole injection in α-naphthylphenylbiphenyl diamine (α-NPD) thin layers
Garcia-Belmonte, Germà; Bisquert, Juan; Bueno, Paulo R.; Graeff, C. F. O.; Castro, F. A. 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 ... -
Kinetics of occupancy of defect states in poly(3-hexylthiophene): fullerene solar cells
Garcia-Belmonte, Germà; Boix, Pablo P; Ajuria, Jon; Etxebarria, Ikerne; Palacios, Roberto Elsevier (2012-01)Energetics and kinetics of defects in the effective band gap of organic bulk heterojunctions are determined by means of capacitance methods. The technique consists of calculating the junction capacitance derivative with ... -
LiFePO4 particle conductive composite strategies for improving cathode rate capability
Vicente-Agut, Nuria; Haro, Marta; Cíntora Juárez, Daniel; Pérez Vicente, Carlos; Tirado, José Luis; Ahmad, Shahzada; Garcia-Belmonte, Germà 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 ... -
Ligand-free synthesis of aluminum-doped zinc oxide nanocrystals and their use as optical spacers in color-tuned highly efficient organic solar cells
Gaceur, Meriem; Dkhil, Sadok Ben; Duché, David; Bencheikh Aboura, Fatima; Simon, Jean-Jacques; Escoubas, Ludovic; Mansour, Mahdi; Guerrero, Antonio; Garcia-Belmonte, Germà; Liu, Xianjie; Fahlmann, Mats; Dachraoui, Walid; Diallo, Abdou Karim; Videlot-Ackermann, Christine; Margeat, Olivier; Ackermann, Jörg Wiley (2016)The color of polymer solar cells using an opaque electrode is given by the refl ected light, which depends on the composition and thickness of each layer of the device. Metal-oxide-based optical spacers are intensively ... -
Light Capacitances in Silicon and Perovskite Solar Cells
Almora Rodríguez, Osbel; Garcia-Belmonte, Germà Elsevier (2019)The framework on which the physics of silicon solar cells (SiSCs) is based robustly predicts dependences of capacitance on light intensity and voltage, even when most recent innovations are considered as the incorporation ... -
Light intensity modulated impedance spectroscopy (LIMIS) in all-solid-state solar cells at open-circuit
Almora Rodríguez, Osbel; Zhao, Yicheng; Du, Xiaoyan; Heumueller, Thomas; Matt, Gebhard Josed; Garcia-Belmonte, Germà; Brabec, Christoph J. Elsevier (2020)Potentiostatic impedance spectroscopy (IS) is a well-established characterization technique for elucidating the electric resistivity and capacitive features of materials and devices. For solar cells, by applying a small ... -
Light-Induced Space-Charge Accumulation Zone as Photovoltaic Mechanism in Perovskite Solar Cells
Zarazúa, Isaac; Bisquert, Juan; Garcia-Belmonte, Germà American Chemical Society (2016)We fabricated formamidinium lead iodide perovskite solar cell for analysis of the photovoltaic mechanism based on the interpretation of the capacitance variation under illumination. It was shown that the low-frequency ... -
Light-modulated TiOx Interlayer Dipole and Contact Activation in Organic Solar Cell Cathodes
Guerrero, Antonio; Chambon, Sylvain; Hirsch, Lionel; Garcia-Belmonte, Germà Wiley (2014-10-22)Understanding working mechanisms of selective interfacial layers and the underlying energetics of the organic semiconductor/electrode interface is an issue of primary concern for improving organic solar cell technologies. ... -
Mechanisms of charge accumulation in the dark operation of perovskite solar cells
Ripolles, Teresa S.; Baranwal, Ajay K.; Nishinaka, Koji; Ogomi, Yuhei; Garcia-Belmonte, Germà; Hayase, Shuzi Royal Society of Chemistry (2016)In this work, a new current peak at forward bias in the dark current–voltage curves has been identified for standard mesoscopic perovskite solar cells. This characteristic peak appears only under some specific conditions, ... -
Molecular Electronic Coupling Controls Charge Recombination Kinetics in Organic Solar Cells of Low Bandgap Diketopyrrolopyrrole, Carbazole, and Thiophene Polymers
Ripollés Sanchis, Teresa; Raga, Sonia R.; Guerrero, Antonio; Welker, Matthias; Turbiez, Mathieu; Bisquert, Juan; Garcia-Belmonte, Germà American Chemical Society (2013)Low-bandgap diketopyrrolopyrrole- and carbazole-based polymer bulk-heterojunction, solar cells exhibit much faster charge carrier recombination kinetics than that encountered for less-recombining poly(3-hexylthiophene). ... -
Nanoscale mapping by electron energy-loss spectroscopy reveals evolution of organic solar cell contact selectivity
Guerrero, Antonio; Pfannmöller, Martin; Kovalenko, Alexander; Ripollés Sanchis, Teresa; Heidari, Hamed; Bals, Sara; Kaufmann, Louis-Dominique; Bisquert, Juan; Garcia-Belmonte, Germà Elsevier (2015)Organic photovoltaic (OPV) devices are on the verge of commercialization being long-term stability a key challenge. Morphology evolution during lifetime has been suggested to be one of the main pathways accounting for ... -
Observation of Long-Term Stable Response in MAPbBr3 Single Crystals Monitored through Displacement Currents under Varying Illumination
García-Batlle, Marisé; Zia, Waqas; Aranda Alonso, Clara; Saliba, Michael; Almora Rodríguez, Osbel; Guerrero, Antonio; Garcia-Belmonte, Germà Wiley-VCH GmbH (2022-06-30)Long life of perovskite devices in working conditions remains the bottleneck for technology application. Stable charge carriers’ transport together with nonreactive contact materials contributes to the increase of the ... -
On Mott-Schottky analysis interpretation of capacitance measurements in organometal perovskite solar cells
Almora Rodríguez, Osbel; Aranda Alonso, Clara; Mas, Elena; Garcia-Belmonte, Germà AIP Publishing (2016)Capacitance response of perovskite-based solar cells (PSCs) can be exploited to infer underlying physical mechanisms, both in the materials bulk and at outer interfaces. Particularly interesting is applying the depletion ... -
On voltage, photovoltage, and photocurrent in bulk heterojunction organic solar cells
Garcia-Belmonte, Germà; Bisquert, Juan American Chemical Society (2011-07)The interpretation of voltage, photovoltage, and photocurrent in polymer/fullerene bulk heterojunction (BHJ) solar cells is discussed in terms of fundamental device models and results of capacitance spectroscopy. First we ...