Listar INAM_Articles por autoría "ef941584-f910-4cea-89fc-b10690d6dc3f"
Mostrando ítems 21-40 de 42
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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 ... -
Long-term field screening by mobile ions in thick metal halide perovskites: understanding saturation currents
Almora Rodríguez, Osbel; Miravet, Daniel; Gelmetti, Ilario; Garcia-Belmonte, Germà Wiley (2022-09-06)Metal halide perovskite-based semiconductor devices with micrometer-to-millimeter-thick perovskite layers show a current response upon polarization which evolves up to several hours, transiting several regimes. This is the ... -
Mechanisms of charge accumulation in the dark operation of perovskite solar cells
Ripolles, Teresa S.; Baranwal, Ajay K.; Nishinaka, Koji; Ogomi, Yuhei; Garcia-Belmonte, Germà; Hayase, Shuzi Royal Society of Chemistry (2016)In this work, a new current peak at forward bias in the dark current–voltage curves has been identified for standard mesoscopic perovskite solar cells. This characteristic peak appears only under some specific conditions, ... -
Methylammonium Lead Bromide Perovskite Battery Anodes Reversibly Host High Li-Ion Concentrations
Vicente-Agut, Nuria; Garcia-Belmonte, Germà American Chemical Society (2017-04)Ions migrate through the hybrid halide perovskite lattice, allowing for a variety of electrochemical applications as perovskite-based electrodes for batteries. It is still unknown how extrinsic defects such as lithium ions ... -
Mobile Ion-Driven Modulation of Electronic Conductivity Explains Long-Timescale Electrical Response in Lead Iodide Perovskite Thick Pellets
García-Batlle, Marisé; Deumel, Sarah; Huerdler, Judith E.; Tedde, Sandro Francesco; Guerrero, Antonio; Almora Rodríguez, Osbel; Garcia-Belmonte, Germà American Chemical Society (2021-07-26)The favorable optoelectronic properties of metal halide perovskites have been used for X- and γ-ray detection, solar energy, and optoelectronics. Large electronic mobility, reduced recombination losses of the electron–hole ... -
Moving Ions Vary Electronic Conductivity in Lead Bromide Perovskite Single Crystals through Dynamic Doping
García-Batlle, Marisé; Baussens, Oriane; Amari, Smaïl; Zaccaro, Julien; Gros-Daillon, Eric; Verilhac, Jean‐Marie; Guerrero, Antonio; Garcia-Belmonte, Germà Wiley (2020-10)Metal halide perovskite single crystals are being explored as functional materials for a variety of optoelectronic applications. Among others, solar cells, field‐effect transistors, and X‐ and γ‐ray detectors have shown ... -
New approaches to the lithiation kinetics in reaction-limited battery electrodes through electrochemical impedance spectroscopy
Vicente-Agut, Nuria; Haro, Marta; Garcia-Belmonte, Germà (2018)Electrochemical impedance spectroscopy is a widely employed technique probing kinetic limitations in the charging of battery electrodes. Hindrance mechanisms locate at the interfaces between the active material and the ... -
Noncapacitive hysteresis in perovskite solar cells at room temperature
Almora Rodríguez, Osbel; Aranda Alonso, Clara; Zarazúa, Isaac; Guerrero, Antonio; Garcia-Belmonte, Germà American Chemical Society (2016)The current density−voltage (J−V) curves of perovskite solar cells have been found to present a hysteresis-like distortion when the measurement is done by sweeping the applied voltage at different scan conditions. ... -
Organohalide Perovskites are Fast Ionic Conductors
Vicente-Agut, Nuria; Garcia-Belmonte, Germà Wiley (2017-10-11)Fast ionic conductors constitute a family of materials exhibiting high values of the ionic conductivity while their crystal structure remains rather rigid. Perovskite-like compounds are known to be good ionic conductors ... -
Perovskite Solar Cell Modeling Using Light- and Voltage-Modulated Techniques
Ravishankar, Sandheep; Aranda Alonso, Clara; Sanchez, Sandy; Bisquert, Juan; Saliba, Michael; Garcia-Belmonte, Germà American Chemical Society (2019-02-27)The analysis of the impedance spectroscopy (IS) data of perovskite solar cells (PSCs) has been challenging so far, with the low-frequency phenomena in particular yielding ambivalent results and interpretations. We tackle ... -
Perovskite solar cells: a brief introduction and some remarks
Almora Rodríguez, Osbel; Vaillant Roca, Lidice; Garcia-Belmonte, Germà Sociedad Cubana de Física (2017)The spectacular and unprecedented rise of so-called perovskite solar cells (PSCs) in conversion efficiency with low-cost manufacturing processes has grabbed the attention of the scientific community ... -
Probing the 3‐step Lithium Storage Mechanism in CH3NH3PbBr3 Perovskite Electrode by Operando‐XRD Analysis
Vicente-Agut, Nuria; Bresser, Dominic; Passerini, Stefano; Garcia-Belmonte, Germà Wiley (2019-01-19)Organic‐inorganic hybrid materials have gradually become one of the most actively studied research fields due to their fascinating properties. The reaction between lithium and organic‐inorganic halide perovskite has just ... -
Properties of Contact and Bulk Impedances in Hybrid Lead Halide Perovskite Solar Cells Including Inductive Loop Elements
Guerrero, Antonio; Garcia-Belmonte, Germà; Mora-Sero, Ivan; Bisquert, Juan; Kang, Yong Soo; Jacobsson, T. Jesper; Correa-Baena, Juan-Pablo; Hagfeldt, Anders American Chemical Society (2016)Impedance spectroscopy offers access to all the different electronic and ionic processes taking place simultaneously in an operating solar cell. To date, its use on perovskite solar cells has been challenging because of ... -
Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals
Peng, Wei; Aranda Alonso, Clara; Bakr, Osman M.; Garcia-Belmonte, Germà; Bisquert, Juan; Guerrero, Antonio American Chemical Society (2018)Lead halide perovskites are mixed electronic–ionic semiconductors that have recently revolutionized the photovoltaics field. The physical characterization of the ionic conductivity has been rather elusive because of the ... -
Recent advances to understand morphology stability of organic photovoltaics
Guerrero, Antonio; Garcia-Belmonte, Germà SpringerOpen (2017)Organic photovoltaic devices are on the verge of commercialization with power conversion efficiencies exceeding 10 % in laboratory cells and above 8.5 % in modules. However, one of the main limitations hindering their ... -
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 ... -
Reversible Formation of Gold Halides in Single‐Crystal Hybrid‐Perovskite/Au Interface upon Biasing and Effect on Electronic Carrier Injection
Pospisil, Jan; Guerrero, Antonio; Zmeskal, Oldrich; Weiter, Martin; Gallardo Bernal, Juan Jesus; Navas, Javier; Garcia-Belmonte, Germà Wiley (2019-08-08)Solar cells, light emitting diodes, and X‐ray detectors based on perovskite materials often incorporate gold electrodes, either in direct or indirect contact with the perovskite compound. Chemical interactions between ... -
Selective Growth of Layered Perovskites for Stable and Efficient Photovoltaics
Taek Cho, Kyung; Lee, Yonghui; Almora Rodríguez, Osbel; Grancini, Giulia; Ryu, Jaehoon; Tschumi, Manuel; Jang, Jyongsik; Paek, Sanghyun; Garcia-Belmonte, Germà; Nazeeruddin, Mohammad Khaja Royal Society of Chemistry (2018-11)Perovskite solar cells (PSCs) are promising alternatives toward clean energy because of their high-power conversion efficiency (PCE) and low materials and processing cost. However, their poor stability under operation ... -
Surface Polarization Model for the Dynamic Hysteresis of Perovskite Solar Cells
Ravishankar, Sandheep; Almora Rodríguez, Osbel; Echeverría-Arrondo, Carlos; Ghahremanirad, Elnaz; Aranda Alonso, Clara; Guerrero, Antonio; Fabregat-Santiago, Francisco; Zaban, Arie; Garcia-Belmonte, Germà; Bisquert, Juan American Chemical Society (2017-02)The dynamic hysteresis of perovskite solar cells consists of the occurrence of significant deviations of the current density–voltage curve shapes depending on the specific conditions of measurement such as starting voltage, ... -
Surface versus Bulk Currents and Ionic Space-Charge Effects in CsPbBr3 Single Crystals
Almora Rodríguez, Osbel; Matt, Gebhard Josed; These, Albert; Kanak, Andrii; Levchuk, Ievgen; Shrestha, Shreetu; Osvet, Andres; Brabec, Christoph J.; Garcia-Belmonte, Germà American Chemical Society (2022-04-25)CsPbBr3 single crystals have potential for application in ionizing-radiation detection devices due to their optimal optoelectronic properties. Yet, their mixed ionic–electronic conductivity produces instability and hysteretic ...