A5068151302- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Semiconductor materials and interfaces
- Thin-Film Transistor Technologies
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Advanced Memory and Neural Computing
- solar cell performance optimization
- Optical Network Technologies
- Silicon and Solar Cell Technologies
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Organic and Molecular Conductors Research
- Thermography and Photoacoustic Techniques
- Molecular Junctions and Nanostructures
- Analytical Chemistry and Sensors
- Photovoltaic System Optimization Techniques
- Optical Wireless Communication Technologies
- Supercapacitor Materials and Fabrication
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
Universidad Rey Juan Carlos
2013-2024
Comunidad de Madrid
2021
Madrid Institute for Advanced Studies
2015
IMDEA Nanoscience
2014
H-shaped oligofluorenes as gain media exhibit excellent photo- (large robustness against oxidation) and thermal stabilities in ambient atmosphere for large σe low-threshold (0.22 nJ pulse−1) deep blue distributed feedback (DFB) lasers. Their amplified spontaneous emission (ASE) thresholds increase less than 3-fold the spectra almost no shift with film samples annealed up to 200 °C open air.
Visible light communication systems can be used in a wide variety of applications, from driving to home automation. The use wearables increase the potential applications indoor send and receive specific customized information. We have designed developed fully organic flexible Light Communication system using OLED, P3HT:PCBM-based photodiode (OPD) PCBs for emitter receiver conditioning circuits. fabricated characterized I-V curve, modulation response impedance OPD. As we commercial luminaire...
The performance of organic solar cells has improved significantly in recent years due to the use non-fullerene acceptors (NFA). While processing additives are typically added active layer blends enhance device NFA cells, their impact on degradation remains unclear. In this work we have compared performance, pristine and degraded state, between air-processed slot-die coated ITO-free with without additive DIO, using a structure PET/Ag/ZnO/PBDB-T:ITIC/FHC PEDOT:PSS. We observed an improvement...
We explain how to obtain closed-form analytic solutions from the set of equations that describe three-diode lumped-parameter equivalent circuit model proposed by Mazhari [1] portray undesirable S-shape often observed in I-V characteristics illuminated organic solar cells (OSCs), and occasionally seen other types cells. This allows quick extraction model's parameter values directly fitting resulting solution cell's measured data. Such mathematical simplification procedure facilitates...
Capacitive response at long time scales seems to remain an elusive feature in the analysis of electrical properties perovskite‐based solar cells. It belongs one critical anomalous effects that arises from characteristic phenomenology this type emerging photovoltaic devices. Thereby, accurately deducing key capacitance new light harvesting perovskites measurements represents a significant challenge regarding interpretation physical processes and control undesired mechanisms, such as slow...
Organic solar cells (OSCs) based on Poly[N-9'-heptadecanyl-2,7-carbazole-alt-5, 5-(4', 7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT):1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6,6) C61 (PCBM) have been electrically dc and ac characterized. Device structure is ITO/Poly(3,4-ethylenedioxy-wthiophene)-poly(4-styrene sulfonate) (PEDOT:PSS)/PCDTBT:PCBM/C60MA/Al. Devices show the so-called S-shaped current-voltage curve that has modeled with a circuit including two diodes in forward reverse...
An organic bulk heterojunction photodetector (OPD) is fabricated on the basis of a blend poly(3-hexyl thiophene):1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6,6) C61. The OPD responsivity calculated from current density-voltage characteristic (J-V) under green-LED illumination obtaining 1 A/W. Frequency response at different biases measured, which shows high-3-dB cutoff frequency 343 kHz -3 V . Impedance measurements are carried out reverse biases, and results fitted with small signal...
In our study, we show that compositional engineering of the "A" site cation ABX3 perovskite structure formed by a mix organic and inorganic cations is an effective route to improve thermal stability solar cells (PSCs). this work, mixed-cation mixed-halide PSCs have been fabricated characterized with temperature, from 253 up 333 K. The active layer based on CsRbFAMAPb(IBr)3 results in more stable device compared standard MAPbI3 devices. Electrical characterization reveals decrease cell...
Impedance Spectroscopy (IS) is a non-destructive characterization technique that has been extensively applied to different electronic devices, such as LEDs, photodiodes and solar cells. This provides access valuable information about dynamical mechanisms (minority carrier recombination, diffusion, etc.) taking place in the layers of device. Besides, material device parameters, dielectric constant, built-in potential, mobilities can be extracted. spectra results from applying small AC signal...
In this work, we have studied degradation mechanisms of nonfullerene-based organic solar cells with PET/Ag/ZnO/PBDTB-T:ITIC/PEDOT:PSS/CPP PEDOT:PSS device structure. We compare pristine and degraded samples that were subjected to outdoor following the standard ISOS-O2 protocol. The ideality factors for different incident wavelengths obtained from open-circuit voltage vs irradiation level current density–voltage (J–V) measurements at temperatures indicate aged recombination is governed by...
The electrical behavior of organic solar cell (OSC) has been analyzed using a simple circuital model consisting on an ideal diode together with series and parallel resistances (R<sub>S</sub> R<sub>P</sub> respectively). Applying Kirchhoff's Laws to the circuit leads transcendental equation that can be solved numerically without approximations Lambert W function. Theoretical expression fitted experimental current-voltage (I-V) curves under forward bias, obtaining fairly accurate values for...
ABSTRACT Amongst the different optoelectronic applications of conjugated polymers, waveguide amplifiers and optically pumped lasers are those requiring larger photochemical stability, owing to large irradiation conditions under operation. In this context, suitable optimization enabling reduction amplified spontaneous emission (ASE) threshold values appears as important synthetic chemistry protocols promote polymer robustness against photo‐oxidation. work, we develop rib waveguides with...
Ideality factor vs. temperature obtained from the dependence of open circuit voltage on irradiation level (inset).
Bias voltage scan rate and mobile ion concentration have a strong influence in J-V curves of metal halide perovskite-based memristors. In addition to hysteresis, some cases also show an anomalous drop current known as negative differential resistance. This feature is usually related electrochemical reactions between the reactive <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{I}^{-}$...