Listar por autoría "b5414c55-565b-40bd-b87b-33f6ba8ed865"
Mostrando ítems 1-11 de 11
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Analytical model for light modulating impedance spectroscopy (LIMIS) in all-solid-state p-n junction solar cells at open-circuit
Almora Rodríguez, Osbel; Miravet, Daniel; Matt, Gebhard J.; Garcia-Belmonte, Germà; Brabec, Christoph J. American Institute of Physics (2010-01-02)Potentiostatic impedance spectroscopy (IS) is a well-known tool for characterization of materials and electronic devices. It can be complemented by numerical simulation strategies relying on drift-diffusion equations without ... -
Characterization of Aerosol Deposited Cesium Lead Tribromide Perovskite Films on Interdigited ITO Electrodes
These, Albert; Khansur, Neamul H; Almora Rodríguez, Osbel; Luer, Larry; Matt, Gebhard J.; Eckstein, Udo; Barabash, Anastasia; Osvet, Andres; Webber, Kyle; Brabec, Christoph J. John Wiley & Sons (2021-01-15)Aerosol deposition (AD) is a promising additive manufacturing method to fabricate low-cost, scalable films at room temperature, but has not been considered for semiconductor processing, so far. The successful preparation ... -
Degradation through Directional Self-Doping and Homogeneous Density of Recombination Centers Hindered by 1,8-Diiodooctane Additive in Non-Fullerene Organic Solar Cells
Almora Rodríguez, Osbel; Wiegand, Julius; López Varo, Pilar; Matt, Gebhard Josed; Brabec, Christoph J. Wiley (2021-03-01)Non-fullerene-based organic solar cells (OSCs) have recently proven to perform with efficiencies above 18%. This is an important milestone for one of the most promising technologies in the fields of flexible and ... -
Discerning recombination mechanisms and ideality factors through impedance analysis of high-efficiency perovskite solar cells
Almora Rodríguez, Osbel; Taek Cho, Kyung; Aghazada, Sadig; Zimmermann, Iwan; Matt, Gebhard J.; Brabec, Christoph J.; Nazeeruddin, Mohammad Khaja; Garcia-Belmonte, Germà Elsevier (2018)The ubiquitous hysteresis in the current-voltage characteristic of perovskite solar cells (PSCs) interferes in a proper determination of the diode ideality factor (n), a key parameter commonly adopted to analyze recombination ... -
Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3
Almora Rodríguez, Osbel; González Lezcano, Alfredo; Guerrero, Antonio; Brabec, Christoph J.; Garcia-Belmonte, Germà American Institute of Physics (2020-08-18)Methylammonium lead iodide (CH3NH3PbI3) is one of the most attractive materials for optoelectronic applications, and it is the most typical absorber in perovskite solar cells, which are unprecedentedly successful devices ... -
Ionic Dipolar Switching Hinders Charge Collection in Perovskite Solar Cells with Normal and Inverted Hysteresis
Almora Rodríguez, Osbel; López Varo, Pilar; Taek Cho, Kyung; Aghazada, Sadig; Meng, Wei; Hou, Yi; Echeverría-Arrondo, Carlos; Zimmermann, Iwan; Matt, Gebhard J.; Jiménez Tejada, Juan Antonio; Brabec, Christoph J.; Nazeeruddin, Mohammad Khaja; Garcia-Belmonte, Germà Elsevier (2019-06-15)Drift-diffusion modeling of the ionic dipole switching from the measurement of fast scanned and long pre-biased electrical response is proposed as a novel protocol for evaluation of limit hysteretic effects in perovskite ... -
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 ... -
Quantifying the Absorption Onset in the Quantum Efficiency of Emerging Photovoltaic Devices
Almora Rodríguez, Osbel; Cabrera, Carlos I.; Garcia Cerrillo, Jose; Kirchartz, Thomas; Rau, Uwe; Brabec, Christoph J. Wiley (2021-04-28)The external quantum efficiency (EQE), also known as incident-photon-to-collected-electron spectra are typically used to access the energy dependent photocurrent losses for photovoltaic devices. The integral over the EQE ... -
Suppressing Nonradiative Recombination in Lead–Tin Perovskite Solar Cells through Bulk and Surface Passivation to Reduce Open Circuit Voltage Losses
Zhang, Kaicheng; Späth, Andreas; Almora Rodríguez, Osbel; Le Corre, Vincent; Wortmann, Jonas; Zhang, Jiyun; Xie, Zhiqiang; Barabash, Anastasia; Hammer, Maria S.; Heumüller, Thomas; Min, Jie; Fink, Rainer H.; Lüer, Larry; Li, Ning; Brabec, Christoph J. American Chemical Society (2022-10-14)Lead–Tin perovskite solar cells (Pb/Sn PSCs) are limited by the intrinsic instability of Sn(II), which tends to oxidize forming Sn vacancies in perovskite films. Herein, a Lewis base β-guanidinopropionic acid (GUA) and ... -
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 ... -
Switching Off Hysteresis in Perovskite Solar Cells by Fine‐Tuning Energy Levels of Extraction Layers
Guerrero, Antonio; Bou, Agustín; Matt, Gebhard J.; Almora Rodríguez, Osbel; Heumueller, Thomas; Garcia-Belmonte, Germà; Bisquert, Juan; Hou, Yi; Brabec, Christoph J. Wiley (2018-07-25)Lead halide perovskites often suffer from a strong hysteretic behavior on their j–V response in photovoltaic devices that has been correlated with slow ion migration. The electron extraction layer has frequently been pointed ...