Listar INAM_Articles por autoría "55cf9d82-4f78-4fa4-b8f6-3e87c074245b"
Mostrando ítems 1-20 de 27
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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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Electrochemical valorization of HMF using Ni/Graphite electrodes
Carvajal, David; Arcas, Ramón; Gouda, Laxman; Fabregat-Santiago, Francisco; Mas, Elena Elsevier (2024-01)The electrooxidation of 5-hydroxymethylfurfural (HMF) into 2,5- furandicarboxilic acid (FDCA) has been successfully accomplished using cost-effective NiO–OH electrodes, prepared through Ni electrodeposition on pencil ... -
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 ... -
Experimental Characterization and Statistical Analysis of Water-Based Gold Nanofluids for Solar Applications: Optical Properties and Photothermal Conversion Efficiency
Burgos Rodríguez, Jorge; Mondragon, Rosa; Elçioğlu, Elif Begüm; Fabregat-Santiago, Francisco; Hernandez, Leonor Wiley (2022-03-26)Optimizing optical and photothermal properties of the solar nanofluids (NFs) to be used in direct absorption solar collectors is a key issue to maximize efficiencies in these collector types. This work both experimentally ... -
Hydrazine sensors development based on a glassy carbon electrode modified with a nanostructured TiO2 films by electrochemical approach
Rahman, Mohammed M.; Alfonso, Valero G.; Fabregat-Santiago, Francisco; Bisquert, Juan; Asiri, Abdullah M.; Alshehri, Abdelmohsen A.; Albar, Hassan A. Springer Verlag (2017)The authors describe a selective hydrazine sensor that is based on the use of a film of TiO2 nanoparticles faceted predominantly at the 101 and 001 sides. The hydrazine (Hyd) sensor was fabricated by depositing the ... -
Improved Stability of Inverted and Flexible Perovskite Solar Cells with Carbon Electrode
Babu, Vivek; Fuentes Pineda, Rosinda; Ahmad, Taimoor; Alvarez, Agustin; Castriotta, Luigi Angelo; Di Carlo, Aldo; Fabregat-Santiago, Francisco; Wojciechowski, Konrad American Chemical Society (2020-06-02)We demonstrate highly efficient, stable, and flexible perovskite solar cells of large areas, utilizing a carbon back-contact electrode in a p–i–n cell configuration. We enabled good electronic contact at the interface with ... -
In situ Biofilm Quantification in Bioelectrochemical Systems by using Optical Coherence Tomography
Molenaar, Sam D.; Sleutels, Tom; Pereira, Joao; Iorio, Matteo; Borsje, Casper; Zamudio, Julian A.; Fabregat-Santiago, Francisco; Buisman, Cees; Ter Heijne, Annemiek Wiley (2018-07-11)Detailed studies of microbial growth in bioelectrochemical systems (BESs) are required for their suitable design and operation. Here, we report the use of optical coherence tomography (OCT) as a tool for in situ and ... -
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 ... -
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 ... -
New Views on Carrier Diffusion and Recombination by Combining Small Perturbation Techniques: Application to BiVO4 Photoelectrodes
Alvarez, Agustin; García-Tecedor, Miguel; Montañés, Laura; Mas, Elena; Gimenez, Sixto; Fabregat-Santiago, Francisco Wiley (2022)Impedance spectroscopy (IS), intensity-modulated photocurrent spectroscopy (IMPS), and intensity-modulated photovoltage spectroscopy (IMVS) are well-established powerful modulated techniques to characterize optoelectronic ... -
Overcoming Charge Collection Limitation at Solid/Liquid Interface by a Controllable Crystal Deficient Overlayer
Zhang, Kan; Ravishankar, Sandheep; Ma, Ming; Veerappan, Ganapathy; Bisquert, Juan; Fabregat-Santiago, Francisco; Park, Jong Hyeok Wiley (2017)Bulk and surface charge recombination of photoelectrode are two key processes that significantly hinder solar-to-fuel conversion of photoelectrochemical cell (PEC). In this study, the function of a “crystal-deficient” ... -
Pencil graphite rods decorated with nickel and nickel-iron as low-cost oxygen evolution reaction electrodes
Arcas, Ramón; Koshino, Yuuki; Mas, Elena; Tsuji, Ryuki; Masutani, Hideaki; Miura-Fujiwara, Eri; Haruyama, Yuichi; Nakashima, Seiji; Ito, Seigo; Fabregat-Santiago, Francisco Royal Society of Chemistry (2021)Society is demanding clean energy to substitute greatly polluting carbon-based fuels. As an alternative, the use of green hydrogen produced by electrocatalysis constitutes a nice strategy as its products and reactants are ... -
Quantification of bio-anode capacitance in bioelectrochemical systems using Electrochemical Impedance Spectroscopy
Ter Heijne, Annemiek; Liu, Dandan; Sulonen, Mira; Sleutels, Tom; Fabregat-Santiago, Francisco Elsevier (2018-10)Understanding the electrochemical properties of bio-anodes is essential to improve performance of bioelectrochemical systems. Electrochemical Impedance Spectroscopy (EIS) is often used to study these properties in detail. ...