Listar FCA_Articles por autoría "55cf9d82-4f78-4fa4-b8f6-3e87c074245b"
Mostrando ítems 21-40 de 61
-
Elucidating Capacitance and Resistance Terms in Confined Electroactive Molecular Layers
Bueno, Paulo R.; Fabregat-Santiago, Francisco; Davis, Jason J. American Chemical Society (2013)Electrochemical analyses on confined electroactive molecular layers, herein exemplified with electroactive self-assembled monolayers, sample current contributions that are significantly influenced by additional nonfaradaic ... -
Enhanced Carrier Transport Distance in Colloidal PbS Quantum-Dot-Based Solar Cells Using ZnO Nanowires
Wang, Haibin; González Pedro, Victoria; Kubo, Takaya; Fabregat-Santiago, Francisco; Bisquert, Juan; Sanehira, Yoshitaka American Chemical Society (2015-11)Nanostructured solar cells are a promising area of research for the production of low cost devices that may eventually be capable of complementing or even replacing present technologies in the field of solar power ... -
Enhanced diffusion through porous nanoparticle optical multilayers
López López, Carmen; Colodrero, Silvia; Raga, Sonia R.; Lindström, Henrik; Fabregat-Santiago, Francisco; Bisquert, Juan; Míguez, Hernán Royal Society of Chemistry (2012)Herein we demonstrate improved mass transport through nano- particle one-dimensional photonic crystals of enhanced porosity. Analysis is made by impedance spectroscopy using iodine and ionic liquid based electrolytes and ... -
Enhanced electrochemical hydrogen peroxide productionfrom surface state modified mesoporous tin oxide catalysts
BinSaeedan, Norah M.; Arunachalam, Prabhakarn; Al-Mayouf, Abdullah; Naji Shaddad, Maged; Amer, Mabrook S.; Beagan, Abeer; Fabregat-Santiago, Francisco; Bisquert, Juan Wiley (2022-05-15)Electrochemical hydrogen peroxide (H2O2) production via the two-electronoxygen reduction reaction (ORR) has received much consideration as a substi-tute to the well-known industrial anthraquinone method. The present ... -
From Flat to Nanostructured Photovoltaics: Balance between Thickness of the Absorber and Charge Screening in Sensitized Solar Cells
Fabregat-Santiago, Francisco; Bisquert, Juan; Mora-Sero, Ivan; Boix, Pablo P; Yong, Hui Lee; Sang, Hyuk Im; Sang, Il Seok American Chemical Society (2012-01)Nanoporous metal oxide electrodes provide a high internal area for dye anchoring in dye-sensitized solar cells, but the thickness required to extinguish the solar photons also enhances recombination at the TiO2/electrolyte ... -
General Working Principles of CH3NH3PbX3 Perovskite Solar Cells
González Pedro, Victoria; Juarez-Perez, Emilio J.; Arsyad, Waode Sukmawati; Barea, Eva M; Fabregat-Santiago, Francisco; Mora-Sero, Ivan; Bisquert, Juan American Chemical Society (2014)Organometal halide perovskite-based solar cells have recently realized large conversion efficiency over 15% showing great promise for a new large scale cost-competitive photovoltaic technology. Using impedance spectroscopy ... -
Harnessing infrared photons for photoelectrochemical hydrogen generation. A PbS quantum dot based "quasi-artificial leaf"
Trevisan, Roberto; Rodenas, Pau; González Pedro, Victoria; Sima, Cornelia; S. Sánchez, Rafael; Barea, Eva M; Mora-Sero, Ivan; Fabregat-Santiago, Francisco; Gimenez, Sixto American Chemical Society (2013)Hydrogen generation by using quantum dot (QD) based heterostructures has emerged as a promising strategy to develop artificial photosynthesis devices. In the present study, we sensitize mesoporous TiO2 electrodes with ... -
High carrier density and capacitance in TiO2 Nanotube arrays induced by electrochemical doping
Fabregat-Santiago, Francisco; Barea, Eva M; Bisquert, Juan; Mor, Gopal K.; Shankar, Karthik; Grimes, Craig A. American Chemical Society (2008)The paper describes the electronic charging and conducting properties of vertically oriented TiO2 nanotube arrays formed by anodization of Ti foil samples. The resulting films, composed of vertically oriented nanotubes ... -
Hole conductivity and acceptor density of p-type CuGaO2 nanoparticles determined by impedance spectroscopy: The effect of Mg doping
Herraiz Cardona, Isaac; Fabregat-Santiago, Francisco; Renaud, Adèle; Julian-Lopez, Beatriz; Odobel, Fabrice; Carioc, Laurent; Jobic, Stéphane; Gimenez, Sixto Elsevier (2013)Delafossite materials like CuGaO2 have appeared as promising p-type semiconductor materials for their exploitation in tandem dye sensitized solar cells and water splitting photoelectrochemical cells. However, the intrinsic ... -
Impedance spectroscopic analysis of high-performance dye sensitized solar cells based on nano-clay electrolytes
González Pedro, Victoria; Sakurai, Hideki; Tomita, Mitsuru; Ito, Bruno Ieri; Fabregat-Santiago, Francisco; Uchida, Satoshi; Segawa, Hiroshi Elsevier (2016)In this work we present quasi-solid state dye-sensitized solar cells obtained employing artificial hydrotalcite nano-clay as electrolyte additive, with a greatly improved photo-energy conversion efficiency of up to 10.9% ... -
Impedance Spectroscopy Analysis of the Effect of TiO2 Blocking Layers on the Efficiency of Dye Sensitized Solar Cells
Góes, Márcio Sousa; Joanni, Ednan; Muniz, Elaine C.; Savu, Raluca; Habeck, Thomas R.; Bueno, Paulo R.; Fabregat-Santiago, Francisco American Chemical Society (2012)The introduction of a dense TiO2 layer between the mesoporous TiO2 network and the charge collector in dye-sensitized solar cell anodes has been claimed to improve the performance of solar cell devices. Two mechanisms have ... -
Impedance spectroscopy of thin-film CdTe/CdS solar cells under varied illumination
Proskuryakov, Y. Y.; Durose, K.; Al Turkestani, M. K.; Mora-Sero, Ivan; Garcia-Belmonte, Germà; Fabregat-Santiago, Francisco; Bisquert, Juan; Barrioz, Vincent; Lamb, Dan; Irvine, S. J. C.; Jones, Eurig Wyn American Institute of Physics (2009)The electrical properties of CdTe/CdS solar cells grown by metal organic chemical vapor deposition were investigated by a technique of impedance measurements under varied intensity of AM1.5 illumination. A generalized ... -
Injection and Recombination in Dye-Sensitized Solar Cells with a Broadband Absorbance Metal-Free Sensitizer Based on Oligothienylvinylene
Caballero, Rubén; Barea, Eva M; Fabregat-Santiago, Francisco; De la Cruz, Pilar; Márquez, Lourdes; Langa, Fernando; Bisquert, Juan American Chemical Society (2008)A new metal-free sensitizer for improved light harvesting with dye-sensitized solar cells (DSC) has been synthesized and fully characterized. The molecular sensitizer was engineered by linking the tiophenes groups by methine ... -
Interfacial engineering of quantum dot-sensitized TiO2 fibrous electrodes for futuristic photoanodes in photovoltaic applications
Sudhagar, P.; González Pedro, Victoria; Mora-Sero, Ivan; Fabregat-Santiago, Francisco; Bisquert, Juan; Kang, Yong Soo Royal Society of Chemistry (2012)Herein we report generic surface treatment approaches to improve the electronic interfaces of quantum dot-sensitized TiO2 fiber electrodes, thereby promoting their photoanode performance. Highly dense, continuous and ... -
Interpretation of cyclic voltammetry measurements of thin semiconductor films for solar fuel applications
Bertoluzzi, Luca; Badia Bou, Laura; Fabregat-Santiago, Francisco; Gimenez, Sixto; Bisquert, Juan American Chemical Society (2013)A simple model is proposed that allows interpretation of the cyclic voltammetry diagrams obtained experimentally for photoactive semiconductors with surface states or catalysts used for fuel production from sunlight. When ... -
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 ... -
Mechanism of carrier accumulation in perovskite thin-absorber solar cells
Mora-Sero, Ivan; González Pedro, Victoria; Fabregat-Santiago, Francisco; Juarez-Perez, Emilio J.; Kim, Hui-Seon; Park, Nam-Gyu; Bisquert, Juan Nature Publishing Group (2013)Photovoltaic conversion requires two successive steps: accumulation of a photogenerated charge and charge separation. Determination of how and where charge accumulation is attained and how this accumulation can be identified ... -
Modeling and characterization of extremely thin absorber (eta) solar cells based on ZnO nanowires
Mora-Sero, Ivan; Gimenez, Sixto; Fabregat-Santiago, Francisco; Azaceta, Eneko; Tena-Zaera, Ramón; Bisquert, Juan RSC Publishing (2011-03-15)Extremely thin absorber (eta)-solar cells based on ZnO nanowires sensitized with a thin layer of CdSe have been prepared, using CuSCN as hole transporting material. Samples with significantly different photovoltaic performance ... -
Near-IR sensitization of wide band gap oxide semiconductor by axially anchored Si-naphthalocyanines
Macor, Lorena; Fungo, Fernando; Tempesti, Tomas; Durantini, Edgardo N.; Otero, Luis; Barea, Eva M; Fabregat-Santiago, Francisco; Bisquert, Juan Royal Society of Chemistry (2009)Near-IR dye sensitized solar cells are very interesting due to their potential applications in panchromatic cells, semi-transparent windows and in tandem cells. In this work we show the utilization of axially anchored ... -
Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar Cells
Alvarez, Agustin; Arcas, Ramón; Aranda Alonso, Clara; Bethencourt, Loengrid; Mas, Elena; Saliba, Michael; Fabregat-Santiago, Francisco American Chemical Society (2020-10-01)Negative capacitance in the low-frequency domain and inverted hysteresis are familiar features in perovskite solar cells, which origin is still under discussion. Here we use impedance spectroscopy to analyze these responses ...