Listar por autoría "55cf9d82-4f78-4fa4-b8f6-3e87c074245b"

Mostrando ítems 1-20 de 83

    • closedAccess   A perspective on the production of dye-sensitized solar modules 

      Fakharuddin, Azhar; Rajan, Jose; Brown, Thomas M.; Fabregat-Santiago, Francisco; Bisquert, Juan Royal Society of Chemistry (2014)
      Dye-sensitized solar cells (DSCs) are well researched globally due to their potential as low-cost photovoltaic (PV) devices especially suited for building and automobile integrated PV (BIPV, AIPV) and portable or indoor ...

    • closedAccess   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 ...

    • openAccess   Analysis of bio-anode performance through electrochemical impedance spectroscopy 

      Heijne, Annemiek ter; Schaetzle, Olivier; Gimenez, Sixto; Navarro, Lucia; Hamelers, Bert; Fabregat-Santiago, Francisco Elsevier (2015-12)
      In this paper we studied the performance of bioanodes under different experimental conditions using polarization curves and impedance spectroscopy. We have identified that the large capacitances of up to 1 mF·cm− 2 for ...

    • closedAccess   Analysis of the Origin of Open Circuit Voltage in Dye Solar Cells 

      Raga, Sonia R.; Barea, Eva M; Fabregat-Santiago, Francisco American Chemical Society (2012)
      Changes in the composition of the electrolyte are known to affect the parameters that determine the performance of dye solar cells. This paper describes a robust method for the analysis of the photovoltage in dye solar ...

    • closedAccess   C60 Thin Films in Perovskite Solar Cells: Efficient or Limiting Charge Transport Layer? 

      Klipfel, Nadja; Alvarez, Agustin; Kanda, Hiroyuki; Sutanto, Albertus Adrian; Igci, Cansu; Roldán-Carmona, Cristina; Momblona, Cristina; Fabregat-Santiago, Francisco; Nazeeruddin, Mohammad Khaja American Chemical Society (2022-02-28)
      In this work, we identify the importance of C60 and compact-TiO2 (cTiO2) as electron transport layers on the device performance of coevaporated n–i–p perovskite solar cells. We found (1) a synergetic effect between both ...

    • closedAccess   Carrier density and interfacial kinetics of mesoporous TiO2 in aqueous electrolyte determined by impedance spectroscopy 

      Gimenez, Sixto; Dunn, Halina K.; Rodenas, Pau; Fabregat-Santiago, Francisco; Miralles, Sara G.; Barea, Eva M; Trevisan, Roberto; Guerrero, Antonio; Bisquert, Juan Elsevier (2012)
      Water splitting at a semiconductor/solution interface with the only input of sunlight to generate hydrogen is one of the most attractive strategies to produce and store chemical energy. In the present study we have ...

    • closedAccess   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 ...

    • closedAccess   Chemical Effects of Tin Oxide Nanoparticles in Polymer Electrolytes-Based Dye-Sensitized Solar Cells 

      Chae, Hwaseok; Song, Donghoon; Lee, Yong-Gun; Son, Taewook; Cho, Woohyung; Pyun, Bum; Kim, Tea-Yon; Lee, Jung Hyun; Fabregat-Santiago, Francisco; Bisquert, Juan; Kang, Yong Soo American Chemical Society (2014-02)
      The effects on the photovoltaic performance of the incorporation of SnO2 nanoparticles into the polymer of a solid-state dye-sensitized solar cell (DSC) based on the poly(ethylene oxide)/poly(ethylene glycol) dimethyl ether ...

    • closedAccess   Co-adsorbing effect of bile acids containing bulky amide groups at 3β-position on the photovoltaic performance in dye-sensitized solar cells 

      Soto-Navarro, Andrea; Alfaro, Ariel; Soto-Tellini, Víctor Hugo; Moehl, Thomas; Barea, Eva M; Fabregat-Santiago, Francisco; Pineda, Leslie William Elsevier (2019)
      Co-adsorbing molecules attain certain control in the surrounding of the dyes leading to enhanced efficiencies mainly by affecting the recombination of the photogenerated electrons and aggregation of dyes. Bile acids such ...

    • openAccess   Combining Modulated Techniques for the Analysis of Photosensitive Devices 

      Alvarez, Agustin; Ravishankar, Sandheep; Fabregat-Santiago, Francisco Wiley-VCH GmbH (2021-09-03)
      Small-perturbation techniques such as impedance spectroscopy (IS), inten-sity-modulated photocurrent spectroscopy (IMPS), and intensity-modulated photovoltage spectroscopy (IMVS) are useful tools to characterize and model ...

    • openAccess   Competitive Photoelectrochemical Methanol and Water Oxidation with Hematite Electrodes 

      Klahr, Benjamin; Gimenez, Sixto; Zandi, Omid; Fabregat-Santiago, Francisco; Hamann, Thomas ACS Publications (2015-03-24)
      Photocatalytic water and methanol oxidation were studied at thin film hematite electrodes synthesized by atomic layer deposition (ALD). Systematic photoelectrochemical characterization along with O2 evolution measurements ...

    • closedAccess   Correcting unintended changes in electroluminescence perturbation for reliable light intensity modulated spectroscopies 

      Alvarez, Agustin; Riquelme, Antonio; Fuentes Pineda, Rosinda; Mas, Elena; Marsal, Lluis F.; Almora Rodríguez, Osbel; Anta, Juan; Fabregat-Santiago, Francisco IOP Publishing (2023-07-21)
      Light intensity modulated photocurrent and photovoltage spectroscopies, IMPS and IMVS respectively, are characterization techniques for studying charge carrier transport and recombination properties of photosensitive samples ...

    • closedAccess   Deleterious Effect of Negative Capacitance on the Performance of Halide Perovskite Solar Cells 

      Fabregat-Santiago, Francisco; Kulbak, Michael; Zohar, Arava; Vallés Pelarda, Marta; Hodes, Gary; Mora-Sero, Ivan American Chemical Society (2017)
      Negative capacitance in photovoltaic devices has been observed and reported in several cases, but its origin, at low or intermediate frequencies, is under debate. Here we unambiguously demonstrate a direct correlation ...

    • openAccess   Design and characterization of alkoxy-wrapped push–pull porphyrins for dye-sensitized solar cells 

      Ripollés Sanchis, Teresa; Guo, Bo-Cheng; Wu, Hui-Ping; Pan, Tsung-Yu; Lee, Hsuan-Wei; Raga, Sonia R.; Fabregat-Santiago, Francisco; Bisquert, Juan; Yeh, Chen-Yu; Wei-Guang Diau, Eric The Royal Society of Chemistry (2012-03-09)
      Three alkoxy-wrapped push–pull porphyrins were designed and synthesized for dye-sensitized solar cell (DSSC) applications. Spectral, electrochemical, photovoltaic and electrochemical impedance spectroscopy properties of ...

    • openAccess   Diffusion-Recombination Impedance Model for Solar Cells with Disorder and Nonlinear Recombination 

      Bisquert, Juan; Mora-Sero, Ivan; Fabregat-Santiago, Francisco Wiley-VCH (2013-09-23)
      The diffusion–recombination model is a key tool in understanding the photovoltaic operation of solar cells. Dye-sensitized solar cells, organic solar cells, and inorganic semiconductor solar cells are systems affected by ...

    • openAccess   Direct Observation of the Chemical Transformations in BiVO4 Photoanodes upon Prolonged Light-Aging Treatments 

      Arcas, Ramón; Cardenas-Morcoso, Drialys; Spadaro, Maria Chiara; García-Tecedor, Miguel; Mesa, Camilo A.; Arbiol, Jordi; Fabregat-Santiago, Francisco; Gimenez, Sixto; Mas, Elena Wiley (2022-03-11)
      Exposing BiVO4 photoanodes to light-aging treatments is known to produce a significant photocurrent enhancement. Until now, the interpretation given to this phenomenon is associated to the formation of oxygen vacancies and ...

    • closedAccess   Effect of Environmental Humidity on the Electrical Properties of Lead Halide Perovskites 

      García-Fernández, Alberto; Moradi, Zahra; Bermúdez-García, Juan Manuel; Sánchez Andújar, Manuel; Gimeno Alfonso, Valero; Castro-García, Socorro; Señarís-Rodríguez, M. A.; Mas, Elena; Garcia-Belmonte, Germà; Fabregat-Santiago, Francisco ACS (2018-12)
      In large quantities, water is detrimental to lead halide perovskite solar cells, mainly because of the decomposition of the perovskite layer. In contrast, the presence of small quantities of water has been observed to play ...

    • openAccess   Effect of the chromophores structures on the performance of solid-state dye sensitized solar cells 

      Tian, Haining; Soto, Andrea; Xu, Bo; Sun, Licheng; Hagfeldt, Anders; Fabregat-Santiago, Francisco; Mora-Sero, Ivan; Kang, Yong Soo; Bisquert, Juan; Barea, Eva M World Scientific Publishing (2014)
      The effect of metal-free chromophores on dye-sensitized solar cell performance is investigated. Solid state dye-sensitized solar cells (ssDSCs) using different molecular sensitizers based on triphenylamine (TPA) with ...

    • openAccess   Electrochemical and Photoelectrochemical Investigation of Water Oxidation with Hematite Electrodes 

      Klahr, Benjamin; Gimenez, Sixto; Fabregat-Santiago, Francisco; Bisquert, Juan; Hamann, Thomas Royal Society of Chemistry (2012-04)
      Atomic layer deposition (ALD) was utilized to deposit uniform thin films of hematite (α-Fe2O3) on transparent conductive substrates for photocatalytic water oxidation studies. Comparison of the oxidation of water to the ...

    • openAccess   Electrochemical reduction of HMF to synthesize added value compounds using CuAg electrodes 

      Carvajal, David; Bolos-Sánchez, Victoria; Solera Rojas, Jose; Mejuto, Carmen; Fabregat-Santiago, Francisco; Mas, Elena Elsevier (2023-12-16)
      In biorefining, Green electrochemistry offers an intelligent approach to produce valuable chemicals that are not derived from fossil fuels. In this study, we demonstrate the electrochemical reduction of 5-hydroxymethylfurfural ...