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Mostrando ítems 270-289 de 508

    • openAccess   Large grain size with reduced non-radiative recombination in potassium incorporated methylammonium-free perovskite solar cells 

      Anaya Gonzalez, Gabriela Stephania; Jeronimo-Rendon, Jose J.; WANG, QIONG; Li, Guixiang; Alvarez, Agustin; Fabregat-Santiago, Francisco; Köbler, Hans; alvarado, jose alberto; Juárez Santiesteban, Hector; Turren Cruz, Silver Hamill; Saliba, Michael; Abate, Antonio Elsevier (2022-12-31)
      Organic–inorganic hybrid halide perovskites are widely considered to be one the most promising material in photovoltaic technology, the use of this semiconductor as absorbent layer in solar cells has attracted considerable ...

    • closedAccess   Large improvement of electron extraction from CdSe quantum dots into a TiO<sub>2</sub> thin layer by N3 dye coabsorption 

      Mora-Sero, Ivan; Dittrich, Thomas; Susha, A. S.; Rogach, A. L.; Bisquert, Juan Elsevier (2008)
      Extraction of electrons and holes photogenerated in CdSe quantum dots (QD) of 2.3 nm diameter, is monitored by Surface Photovoltage Spectroscopy. The extraction of electrons into a thin TiO<sub>2</sub> layer increases ...

    • openAccess   Lead Sulfide Nanocubes for Solar Energy Storage 

      Lemsi, Amira; Cardenas-Morcoso, Drialys; Haro, Marta; Gil Barrachina, Carlos; Aranda Alonso, Clara; Maghraoui Meherzi, Hager; García-Tecedor, Miguel; Gimenez, Sixto; Julian-Lopez, Beatriz Wiley (2020-04-23)
      Lead sulfide (PbS) nanocubes are produced by a very simple solvothermal procedure that uses a unique molecule, ethylenediamine, as solvent and capping ligand to control the size and shape of the nanocrystals. Detailed ...

    • closedAccess   Lead-Free Perovskite Solar Cells 

      Kamat, Prashant V.; Bisquert, Juan; Buriak, Jillian American Chemical Society (2017)

    • openAccess   Li2SnO3 branched nano- and microstructures with intense and broadband white-light emission 

      García-Tecedor, Miguel; Bartolomé, Javier; Maestre, David; Trampert, Achim; Cremades, Ana Springer Verlag (2019)
      Exploiting the synergy between microstructure, morphology and dimensions by suitable nanomaterial engineering, can effectively upgrade the physical properties and material performances. Li2SnO3 elongated nano- and ...

    • openAccess   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 ...

    • openAccess   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 ...

    • openAccess   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 ...

    • openAccess   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 ...

    • openAccess   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 ...

    • closedAccess   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. ...

    • closedAccess   Linearity, saturation and blocking in a large multiionic channel: divalent cation modulation of the OmpF porin conductance 

      García Giménez, Elena; López Peris, María Lidón; Aguilella, Vicente; Alcaraz, Antonio Elsevier (2011-01)
      Measurement of unitary conductance is a fundamental step in the characterization of a protein ion channelpermeabilizing a membrane. We study here the effect of salts of divalent cations on the OmpF channelconductance ...

    • closedAccess   Lipid charge regulation of non-specific biological ion channels 

      Aguilella, Vicente; Verdiá Báguena, Carmen; Alcaraz, Antonio Royal Society of Chemistry (2014)
      Ion channels are specialized proteins that enable the movement of charges through otherwise impermeable lipidic membranes. Their action is essential in living organisms facilitating electric signaling, muscle contraction ...

    • openAccess   Lipid Headgroup Charge and Acyl Chain Composition Modulate Closure of Bacterial β-Barrel Channels 

      Perini, Deborah Aurora; Alcaraz, Antonio; Queralt-Martín, María MDPI (2019-02)
      The outer membrane of Gram-negative bacteria contains β-barrel proteins that form high-conducting ion channels providing a path for hydrophilic molecules, including antibiotics. Traditionally, these proteins have been ...

    • openAccess   Localized versus delocalized states: Photoluminescence from electrochemically synthesized ZnO nanowires 

      Voss, Tobias; Bekeny, Chegnui; Gutowski, J.; Tena-Zaera, Ramón; Elias, Jamil; Lévy-Clément, Claude; Mora-Sero, Ivan; Bisquert, Juan American Institute of Physics (2009)
      We analyze the near-band-edge photoluminescence of electrochemically deposited ZnO nanowires and directly correlate the photoluminescence properties with the carrier concentration in the nanowires as determined from ...

    • openAccess   Locating the Frequency of Turnover in Thin-Film Diffusion Impedance 

      Janssen, Mathijs; Bisquert, Juan American Chemical Society (2021-07-12)
      The impedance of diffusion is an important tool to investigate a wide variety of systems, including electrochemical devices such as Li-ion batteries, porous electrodes, and solar cells. The classical impedance model ...

    • openAccess   Long-term potentiation mechanism of biological postsynaptic activity in neuro-inspired halide perovskite memristors 

      HERNÁNDEZ-BALAGUERA, ENRIQUE; Muñoz-Díaz, Laura; Bou, Agustín; Romero, Beatriz; Ilyassov, Baurzhan; Guerrero, Antonio; Bisquert, Juan IOP Publishing (2023-05-26)
      Perovskite memristors have emerged as leading contenders in brain-inspired neuromorphic electronics. Although these devices have been shown to accurately reproduce synaptic dynamics, they pose challenges for in-depth ...

    • openAccess   Lossless equalization of frequency combs 

      Torres Company, Víctor; Lancis, Jesús; Andrés, Pedro Optical Society of America (2008)
      Frequency combs obtained by sinusoidal phase modulation of narrow-band continuous-wave lasers are widely used in the field of optical communications. However, the resulting spectral envelope of the comb is not at. ...

    • closedAccess   Low-temperature processed electron collection layers of graphene/TiO 2 nanocomposites in thin film perovskite solar cells 

      Wang, Jacob Tse-Wei; Ball, James M.; Barea, Eva M; Abate, Antonio; Alexander-Webber, Jack A.; Huang, Jian; Saliba, Michael; Mora-Sero, Ivan; Bisquert, Juan; Snaith, Henry J.; Nicholas, Robin J. American Chemical Society (2014)
      The highest efficiencies in solution-processable perovskite-based solar cells have been achieved using an electron collection layer that requires sintering at 500 °C. This is unfavorable for low-cost production, applications ...

    • openAccess   Majorana-like Zero Modes in Kekulé Distorted Sonic Lattices 

      Gao, Penglin; Torrent, Daniel; Cervera, Francisco; San-Jose, Pablo; Sánchez-Dehesa, José; Christensen, Johan American Physical Society (2019)
      Topological phases have recently been realized in bosonic systems. The associated boundary modes between regions of distinct topology have been used to demonstrate robust waveguiding, protected from defects by the topology ...