Listar Departament: Física por autoría "ef941584-f910-4cea-89fc-b10690d6dc3f"

Mostrando ítems 61-80 de 94

    • closedAccess   Open-Circuit Voltage Limitation in Low-Bandgap Diketopyrrolopyrrole-Based Polymer Solar Cells Processed from Different Solvents 

      Pérez Boix, Pablo; Wienk, Martijn M.; Janssen, René A. J.; Garcia-Belmonte, Germà ACS (2011-06)
      Low-bandgap diketopyrrolopyrrole-based polymer bulk-heterojunction solar cells prepared from different solvents are studied by means of capacitance measurements. Large variations of both photovoltage and photocurrent are ...

    • openAccess   Operating Mechanisms of Mesoscopic Perovskite Solar Cells through Impedance Spectroscopy and J-V Modeling 

      Zarazúa, Isaac; Sidhik, Siraj; López-Luke, Tzarara; Esparza, Diego; De la Rosa, Elder; Reyes-Gomez, J.; Mora-Sero, Ivan; Garcia-Belmonte, Germà American Chemical Society (2017-11)
      The performance of perovskite solar cell (PSC) is highly sensitive to deposition conditions, the substrate, humidity, and the efficiency of solvent extraction. However, the physical mechanism involved in the observed changes ...

    • closedAccess   Operating modes of sandwiched light-emitting electrochemical cells 

      Lenes, Martijn; Garcia-Belmonte, Germà; Tordera, Daniel; Pertegás, Antonio; Bisquert, Juan; Bolink, Henk J. Wiley (2011-03-14)
      Light-emitting electrochemical cells (LECs) are promising lighting devices in which the redistribution of ionic charges allows for double electronic carrier injection from air-stable electrodes. Uncertainties about the ...

    • openAccess   Oxygen doping-induced photogeneration loss in P3HT:PCBM solar cells 

      Garcia-Belmonte, Germà; Ripollés Sanchis, Teresa; Guerrero, Antonio; Boix, Pablo P; Marchesi, Luis F.; Pereira, Ernesto C. Elsevier (2012-05)
      This work investigates the loss in performance induced by molecular oxygen in bulk heterojunction solar cells. We observe that upon exposure to molecular oxygen both formation of P3HT+:O2− complex and metal oxidation at ...

    • openAccess   Oxygen Reduction Reaction Promotes Li+ Desorption from Cathode Surface in Li-O2 Batteries 

      Haro, Marta; Vicente-Agut, Nuria; Garcia-Belmonte, Germà Wiley (2015-11-09)
      Li-O2 batteries are claimed to be one of the future energy storage technologies. Great number of scientific and technological challenges should be solved first to transform Li-O2 battery from a promise to real practical ...

    • openAccess   Partial coverage methylammonium lead bromide films for solar cell application 

      Mhamdi, Asya; Vicente-Agut, Nuria; Bouazizi, Abdelaziz; Garcia-Belmonte, Germà Elsevier (2019-11-30)
      Hybrid perovskite compounds as methylammonium lead halides are currently been investigated for different optoelectronic applications. CH3NH3PbBr3 is a promising member because of its electronic structure and large bandgap ...

    • closedAccess   Perimeter leakage current in polymer light emitting diodes 

      Garcia-Belmonte, Germà; Montero Martín, José María; Ayyad Limonge Yassid; Barea, Eva M; Bisquert, Juan; Bolink, Henk J. Elsevier (2009)
      Observation of leakage current paths through the device perimeter in standard poly(phenylene vinylene)-based light-emitting devices is reported. Perimeter leakage currents govern the diode performance in reverse and low ...

    • openAccess   Perovskite solar cells: a brief introduction and some remarks 

      Almora Rodríguez, Osbel; Vaillant Roca, Lidice; Garcia-Belmonte, Germà Sociedad Cubana de Física (2017)
      The spectacular and unprecedented rise of so-called perovskite solar cells (PSCs) in conversion efficiency with low-cost manufacturing processes has grabbed the attention of the scientific community ...

    • closedAccess   Photoinduced Giant Dielectric Constant in Lead Halide Perovskite Solar Cells 

      Juarez-Perez, Emilio J.; S. Sánchez, Rafael; Badia Bou, Laura; Garcia-Belmonte, Germà; Kang, Yong Soo; Mora-Sero, Ivan; Bisquert, Juan American Chemical Society (2014-06)
      Organic-inorganic lead trihalide perovskites have emerged as an outstanding photovoltaic material that demonstrated a high 17.9% conversion efficiency of sunlight to electricity in a short time. We have found a giant ...

    • closedAccess   Photovoltaic efficiency limits and material disorder 

      Nayak, Pabitra K.; Garcia-Belmonte, Germà; Kahn, Antoine; Bisquert, Juan; Cahen, David Royal Society of Chemistry (2012)
      Solar cells based on crystalline semiconductors such as Si and GaAs provide nowadays the highest performance, but photovoltaic (PV) cells based on less pure materials, such as poly- or nano-crystalline or amorphous inorganic ...

    • openAccess   Polarization Switching and Light-Enhanced Piezoelectricity in Lead Halide Perovskites 

      Coll, Mariona; Gómez, Andrés; Mas, Elena; Almora Rodríguez, Osbel; Garcia-Belmonte, Germà; Campoy-Quiles, Mariano; Bisquert, Juan American Chemical Society (2015-03)
      We investigate the ferroelectric properties of photovoltaic methylammonium lead halide CH3NH3PbI3 perovskite using piezoelectric force microscopy (PFM) and macroscopic polarization methods. The electric polarization is ...

    • openAccess   Predicting thermal stability of organic solar cells through an easy and fast capacitance measurement 

      Tessarolo, Marta; Guerrero, Antonio; Gedefaw, Desta; Bolognesi, Margherita; Prosa, Mario; Xu, Xiaofeng; Mansour, Mahdi; Wang, Ergang; Seri, Mirko; Andersson, Mats R.; Muccini, Michele; Garcia-Belmonte, Germà Elsevier (2015-10)
      Degradation of organic photovoltaic (OPV) devices is currently a topic under intense research as it is one of the main limitations towards the commercialization of this technology. Morphological changes at both active layer ...

    • closedAccess   Probing Lithiation Kinetics of Carbon-Coated ZnFe2O4 Nanoparticle Battery Anodes 

      Martínez Julian, Fernando; Guerrero, Antonio; Haro, Marta; Bisquert, Juan; Bresser, Dominic; Paillard, Elie; Passerini, Stefano; Garcia-Belmonte, Germà American Chemical Society (2014-03)
      The investigation of the lithiation-delithiation kinetics of anodes comprising carbon-coated ZnFe2O4 nanoparticles is reported in here. The study confirmed that, as occurring with other conversion electrodes, lithiation ...

    • openAccess   Properties of Contact and Bulk Impedances in Hybrid Lead Halide Perovskite Solar Cells Including Inductive Loop Elements 

      Guerrero, Antonio; Garcia-Belmonte, Germà; Mora-Sero, Ivan; Bisquert, Juan; Kang, Yong Soo; Jacobsson, T. Jesper; Correa-Baena, Juan-Pablo; Hagfeldt, Anders American Chemical Society (2016)
      Impedance spectroscopy offers access to all the different electronic and ionic processes taking place simultaneously in an operating solar cell. To date, its use on perovskite solar cells has been challenging because of ...

    • closedAccess   Recombination in Organic Bulk Heterojunction Solar Cells: Small Dependence of Interfacial Charge Transfer Kinetics on Fullerene Affinity 

      Guerrero, Antonio; Marchesi, Luis F.; Boix, Pablo P; Bisquert, Juan; Garcia-Belmonte, Germà American Chemical Society (2012)
      We investigate the causes for obtaining higher open-circuit voltage in solar cells that use a fullerene with a smaller electron affinity. Using impedance spectroscopy technique, we show that the change of fullerene LUMO ...

    • closedAccess   Recombination rates in heterojunction silicon solar cells analyzed by impedance spectroscopy at forward bias and under illumination 

      Mora-Sero, Ivan; Luo, Yan; Garcia-Belmonte, Germà; Bisquert, Juan; Muñoz, Delfina; Voz Sanchez, Cristobal; Puigdollers, Joaquim; Alcubilla, Ramon 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 ...

    • closedAccess   Relaxation of Photogenerated Carriers in P3HT:PCBM Organic Blends 

      Moehl, Thomas; Kytin, Vladimir G.; Bisquert, Juan; Kunst, Marinus; Bolink, Henk J.; Garcia-Belmonte, Germà Wiley (2009)
      Relaxing in the sunlight. Long time-transient decays of photogenerated carriers in P3HT:PCBM blends for organic solar cells are interpreted in terms of the relaxation of hole carriers in a broad density of states. The ...

    • openAccess   Removing Instability-Caused Low-Frequency Features in Small Perturbation Spectra of Perovskite Solar Cells 

      Ravishankar, Sandheep; García-Batlle, Marisé; Bisquert, Juan; Garcia-Belmonte, Germà; Odrobina, Jann; Schiller, Carl-Albrecht American Chemical Society (2020-06-29)
      Small-perturbation frequency-domain techniques such as impedance spectroscopy and intensity-modulated photocurrent spectroscopy (IMPS) have become important methods for the investigation of the physical working mechanisms ...

    • openAccess   Role of Vertical Segregation in Semitransparent Organic Photovoltaics 

      Kovalenko, Alexander; Guerrero, Antonio; Garcia-Belmonte, Germà ACS Publications (2015)
      In this work, the efficiency of semitransparent organic photovoltaic (OPV) devices for low intensity applications is investigated as a function of the processing conditions. It is observed that a thermal treatment of the ...

    • closedAccess   Role of Zn0 electron-selective layers in regular and inverted bulk heterojunction solar cells 

      Garcia-Belmonte, Germà; Bisquert, Juan; Pérez Boix, Juan; Pacios, Roberto; Etxebarria, Ikerne; Ajuria, Jon American Chemical Society (2011-02)
      Here the role of metal oxide (ZnO) electron-selective layers in the operating mechanisms of bulk-heterojunction polymer−fullerene solar cells is addressed. Inverted as well as regular structures containing ZnO layers at ...