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Mostrando ítems 382-401 de 511

    • openAccess   Real-Time Observation of Iodide Ion Migration in Methylammonium Lead Halide Perovskites 

      Li, Cheng; Guerrero, Antonio; Yu, Zhong; Gräser, Anna; Melo Luna, Carlos Andres; Köhler, Jürgen; Bisquert, Juan; Hildner, Richard; Huettner, Sven Wiley (2017)
      Organic-inorganic metal-halide perovskites (e.g. CH3NH3PbI3-xClx) emerged as a promising opto-electronic material. However, the Shockley–Queisser Limit for the power conversion efficiency (PCE) of perovskite-based photovoltaic ...

    • 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 in Quantum Dot Sensitized Solar Cells 

      Mora-Sero, Ivan; Gimenez, Sixto; Fabregat-Santiago, Francisco; Gómez, Roberto; Shen, Qing; toyoda, taro; Bisquert, Juan American Chemical Society (2009-11)
      Quantum dot sensitized solar cells (QDSCs) have attracted significant attention as promising third-generation photovoltaic devices. In the form of quantum dots (QDs), the semiconductor sensitizers have very useful and often ...

    • 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 ...

    • openAccess   Recombination reduction on lead halide perovskite solar cells based on low temperature synthesized hierarchical TiO2 nanorods 

      Jaramillo Quintero, Óscar A.; Solís de la Fuente, Mauricio; S. Sánchez, Rafael; Recalde, Ileana B.; Juarez-Perez, Emilio J.; Rincón, Marina; Mora-Sero, Ivan Royal Society of Chemistry (2016)
      Intensive research on the electron transport material (ETM) has been pursued to improve the efficiency of perovskite solar cells (PSCs) and decrease their cost. More importantly, the role of the ETM layer is not yet fully ...

    • openAccess   Reconfigurable RF-Waveform Generation Based on Incoherent-Filter Design 

      Andrés, Pedro; Lancis, Jesús; Torres Company, Víctor; Chen, Lawrence R. 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 ...

    • closedAccess   Rectification properties and pH-dependent selectivity of meningococcal class 1 porin 

      Cervera, Javier; Komarov, Alexander G.; Aguilella, Vicente (2008)
      We studied the current rectification properties and selectivity of class 1 porin (PorA) from Neisseria meningitidis (strain H44/76 A3A4) reconstituted in planar lipid membranes varying salt concentrations and pH. PorA ...

    • openAccess   Redox-active hierarchical assemblies of hybrid polyoxometalate nanostructures at carbon surfaces 

      Amin, Sharad; Cameron, Jamie; Cousins, Richard B.; Wrigley, James; Liirò Peluso, Letizia; Sans, Victor; Walsh, Darren; Newton, Graham Royal Society of Chemistry (2022-03-03)
      The self-assembly of hierarchical nanostructures on surfaces is a promising strategy for the development of a wide range of new technologies, such as energy-storage devices and sensors. In this work we show that amphiphilic, ...

    • openAccess   Relative Impacts of Methylammonium Lead Triiodide Perovskite Solar Cells Based on Life Cycle Assessment 

      Alberola-Borràs, Jaume-Adrià; Vidal, Rosario; Juarez-Perez, Emilio J.; Mas, Elena; Guerrero, Antonio; Mora-Sero, Ivan Elsevier (2017-11-22)
      The environmental performance of four different device assembly procedures based on hybrid halide perovskite solar cell (PSC) were assessed from cradle to grave using life cycle assessment (LCA) methodology. In addition, ...

    • closedAccess   Relaxation dynamics of poly(vinylidene fluoride) studied by dynamical mechanical measurements and dielectric spectroscopy 

      Andrio, Andreu; Sencadas, V.; lanceros-mendez, senentxu; Sabater Serra, Roser; Gomez Ribelles, Jose Luis EDP Sciences (2012)
      The aim of this study is to analyze the mobility of polymer chains in semicrystalline poly(vinylidene fluoride) (PVDF). PVDF crystallizes from the melt in the α crystalline phase. The transformation from the α phase to the ...

    • closedAccess   Relaxation of Electron Carriers in the Density of States of Nanocrystalline TiO2 

      Bertoluzzi, Luca; Herraiz Cardona, Isaac; Gottesman, Ronen; Zaban, Arie; Bisquert, Juan American Chemical Society (2014-01)
      Band gap localized states and surface states play a dominant role in the application of nanocrystalline metal oxides to photovoltaics and solar fuel production. Electrons injected in nanocrystalline TiO2 by voltage or ...

    • 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   Relevance of Viroporin Ion Channel Activity on Viral Replication and Pathogenesis 

      Nieto Torres, José L.; Verdiá Báguena, Carmen; Castaño Rodríguez, Carlos; Aguilella, Vicente; Enjuanes, Luis MDPI (2015-07)
      Modification of host-cell ionic content is a significant issue for viruses, as several viral proteins displaying ion channel activity, named viroporins, have been identified. Viroporins interact with different cellular ...

    • 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   Resolution-enhanced optical coherence tomography based on classical intensity interferometry 

      Lajunen, Hanna; Torres Company, Víctor; Lancis, Jesús; Friberg, Ari T. Optical Society of America (2009)
      We propose a fourth-order interference scheme for optical coherence tomography operating with broadband incoherent (or quasi-incoherent) light. It is shown that using this proposal, an axial resolution improvement by a ...

    • openAccess   Revealing the contribution of singlet oxygen in the photoelectrochemical oxidation of benzyl alcohol 

      Arcas, Ramón; Peris, Eduardo; Mas, Elena; Fabregat-Santiago, Francisco Royal Society of Chemistry (2021-02)
      Photoelectrochemical approaches are finding use in the transformation of organic molecules beyond water oxidation and CO2 reduction. Among the different reactions that can be performed, the selective oxidation of alcohols ...

    • openAccess   Role of Severe Acute Respiratory Syndrome Coronavirus Viroporins E, 3a, and 8a in Replication and Pathogenesis 

      Castaño Rodríguez, Carlos; Honrubia, José M.; Gutiérrez-Álvarez, Javier; De Diego, Marta L.; Nieto Torres, José L.; Jiménez Guardeño, José M.; Regla Nava, José A.; Fernández Delgado, Raúl; Verdiá Báguena, Carmen; Queralt-Martín, María; Kochan, Grazyna; Perlman, Stanley; Aguilella, Vicente; Sola, Isabel; Enjuanes, Luis American Society for Microbiology (2018)
      Viroporins are viral proteins with ion channel (IC) activity that play an important role in several processes, including virus replication and pathogenesis. While many coronaviruses (CoVs) encode two viroporins, severe ...

    • closedAccess   Role of the Selective Contacts in the Performance of Lead Halide Perovskite Solar Cells 

      Juarez-Perez, Emilio J.; Wuβler, Michael; Fabregat-Santiago, Francisco; Lakus Wollny, Kerstin; Mankel, Eric; Mayer, Thomas; Jaegermann, Wolfram; Mora-Sero, Ivan American Chemical Society (2014-01)
      The effect of electron- and hole-selective contacts in the final cell performance of hybrid lead halide perovskite, CH3NH3PbI3, solar cells has been systematically analyzed by impedance spectroscopy. Complete cells with ...

    • 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 ...