A5037439682- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Solid-state spectroscopy and crystallography
- solar cell performance optimization
- Catalytic Processes in Materials Science
- Magnetism in coordination complexes
- Ga2O3 and related materials
- Ferroelectric and Piezoelectric Materials
- ZnO doping and properties
- 2D Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Molecular Junctions and Nanostructures
- Silicon and Solar Cell Technologies
- Metal complexes synthesis and properties
- Photovoltaic System Optimization Techniques
- Electronic and Structural Properties of Oxides
- Crystallography and molecular interactions
- Luminescence Properties of Advanced Materials
- Advanced Photonic Communication Systems
Parc Científic de la Universitat de València
2016-2025
Universitat de València
2016-2025
Arizona State University
2023
University of Colorado Boulder
2023
National Renewable Energy Laboratory
2023
Rice University
2023
Helmholtz-Zentrum Berlin für Materialien und Energie
2018-2020
Instituto de Física Corpuscular
2015-2019
Universitat Jaume I
2014
Trap-assisted recombination, despite being lower as compared with traditional inorganic solar cells, is still the dominant recombination mechanism in perovskite cells (PSCs) and limits their efficiency. We investigate attributes of primary trap-assisted channels (grain boundaries interfaces) correlation to defect ions PSCs. achieve this by using a validated device model fit simulations experimental data efficient vacuum-deposited p-i-n n-i-p CH3NH3PbI3 including light intensity dependence...
We introduce new hole-selective contacts for next-generation perovskite photovoltaics and point to design paths molecular engineering of perfect interfaces.
Methylammonium lead halide perovskites have emerged as high performance photovoltaic materials. Most of these solar cells are prepared via solution-processing and record efficiencies (>20%) been obtained employing with mixed halides organic cations on (mesoscopic) metal oxides. Here, we demonstrate fully vacuum deposited planar perovskite by depositing methylammonium iodide in between intrinsic doped charge transport molecules. Two configurations, one inverted respect to the other, p-i-n...
Thin-film solar cells suffer from various types of recombination, which leakage current usually dominates at lower voltages. Herein, we demonstrate first a three-order reduction the shunt loss mechanism in planar methylammonium lead iodide perovskite by replacing commonly used hole transport layer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with better hole-selective polyarylamine. As result, these exhibit superior operation under reduced light conditions, for extreme...
Perovskite solar cells (PSCs) are one of the main research topics photovoltaic community; with efficiencies now reaching up to 24%, PSCs on way catching classical inorganic cells. However, have not yet reached their full potential. In fact, efficiency is still limited by nonradiative recombination, mainly via trap-states and losses due poor transport properties commonly used layers (TLs). Indeed, state-of-the-art TLs (especially if organic) suffer from rather low mobilities, typically within...
Vacuum deposition methods are increasingly applied to the preparation of perovskite films and devices, in view possibility prepare multilayer structures at low temperature. Vacuum-deposited, wide-bandgap solar cells based on mixed-cation mixed-anion perovskites have been scarcely reported, due challenges associated with multiple-source processing thin films. In this work, we describe a four-source vacuum process type FA1–nCsnPb(I1–xBrx)3 tunable bandgap controlled morphology, using FAI, CsI,...
Abstract Hybrid lead halide perovskites are promising materials for future photovoltaics applications. Their spectral response can be readily tuned by controlling the composition, while their stability is strongly dependent on film morphology and type of organic cation used. Mixed mixed systems have led to most efficient stable perovskite solar cells reported, so far they prepared exclusively solution‐processing. This might due technical difficulties associated with vacuum deposition from...
Thin-film solar cells suffer from various types of recombination, which leakage current usually dominates at lower voltages. Herein, we demonstrate first a three-order reduction the shunt loss mechanism in planar methylammonium lead iodide perovskite by replacing commonly used hole transport layer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with better hole-selective polyarylamine. As result, these exhibit superior operation under reduced light conditions, for extreme...
To improve the efficiency of existing perovskite solar cells (PSCs), a detailed understanding underlying device physics during their operation is essential. Here, model has been developed and validated that describes PSCs quantitatively explains role contacts, electron hole transport layers, charge generation, drift diffusion carriers recombination. The simulation to experimental data vacuum‐deposited CH 3 NH PbI over multiple thicknesses fit behavior under different operating conditions...
Efficient methylammonium lead iodide perovskite-based solar cells have been prepared in which the perovskite layer is sandwiched between two organic charge transporting layers that block holes and electrons, respectively. This configuration leads to stable reproducible devices do not suffer from strong hysteresis effects when optimized efficiencies close 15%. The formed by using a dual-source thermal evaporation method, whereas are processed solution. method smooth films allows for high...
Perovskite solar cells are analyzed by photo- and electroluminescence hyperspectral imaging. Significant spatial inhomogeneities in the quasi-Fermi level splitting observed.
Planar diode structures employing hybrid organic-inorganic methylammonium lead iodide perovskites to multifunctional devices exhibiting both a high photovoltaic efficiency and good electroluminescence. The electroluminescence strongly improves at higher current density applied using pulsed driving method.
For methylammonium lead iodide perovskite solar cells prepared by co-evaporation, power conversion efficiencies of over 20% have been already demonstrated, however, so far, only in n-i-p configuration. Currently, the overall major challenges are complex evaporation characteristics organic precursors that strongly depend on underlying charge selective contacts and insufficient reproducibility co-evaporation process. To ensure a reliable process, it is important to identify impact different...
A simple vacuum deposition method for the preparation of high quality hybrid organic-inorganic methylammonium lead iodide perovskite thin films is reported. When sandwiched in between organic charge transporting layers, such to solar cells with a power conversion efficiency 12.2%.
Vacuum deposition techniques are used to prepare mixed iodide–bromide methylammonium lead perovskite diodes via an intermediate double layer of the pure iodide and bromide perovskites. The bright electroluminescence, whose emission spectra maxima shift from infrared toward visible with increasing content. When illuminated AM1.5 simulated sunlight devices function as efficient solar cells power conversion efficiencies high 12.9%.
Low-dimensional (quasi-) 2D perovskites are being extensively studied in order to enhance the stability and open-circuit voltage of perovskite solar cells. Up now, thin layers on surface and/or at grain boundaries 3D have been deposited solely by solution processing, leading unavoidable intermixing between two phases. In this work, we report fabrication 2D/3D/2D heterostructures dual-source vacuum deposition, with aim studying interaction phases as well charge transport properties neat 2D/3D...
Methylammonium lead mixed-halide perovskites MAPb(BrxI1–x)3 are promising materials for the preparation of tandem devices. When exposed to light, segregates in iodide- and bromide-rich phases, limiting achievable photovoltage hence attainable device efficiency. To date only solution-processed have been demonstrated. We present fully vacuum-deposited perovskite thin films with band gap 1.72 1.87 eV, prepared by controlling deposition rates different halide precursors. used thin-film devices,...
Extremely long-lived LEC devices have been achieved using [Ir(C^N)<sub>2</sub>(bpy)]<sup>+</sup> complexes with phenyl-substituted C^N ligands.
New small molecules based on 9,9-bis(4-diphenylaminophenyl)fluorene functionalized with triphenylamine moieties are developed for use as dopant-free hole transporting materials (HTMs) in planar inverted perovskite solar cells. Power conversion efficiencies (PCE) high 17.1% obtained good stability.
Preparation of black formamidinium lead iodide (FAPbI3) requires high-temperature annealing and the incorporation smaller A-site cations, such as methylammonium (MA+), cesium, or rubidium. A major advantage vacuum processing is possibility to deposit perovskite films at room temperature (RT), without any step. Here we demonstrate stabilization cubic phase RT, in a three-source co-sublimation method. We found that MA+ self-limiting process, where amount which incorporated essentially unvaried...
Halide perovskites have generated considerable research interest due to their excellent optoelectronic properties in the past decade. To ensure formation of high-quality semiconductors, deposition process for perovskite film is a critical issue. Vacuum-based processing considered be promising method, allowing, principle, uniform on large area. One benefits vacuum control over composition through use quartz crystal microbalances (QCMs) that monitor rates components situ. In metal halide...
Vacuum processing of multicomponent perovskites is not straightforward, because the number precursors in principle limited by available thermal sources. Herein, we present a process which allows increasing complexity formulation vacuum-deposited lead halide perovskite films multisource deposition and premixing both inorganic organic components. We apply it to preparation wide-bandgap CsMAFA triple-cation solar cells, are found be efficient but thermally stable. With aim stabilizing phase,...
Abstract Wide bandgap perovskites are being widely studied in view of their potential applications tandem devices and other semitransparent photovoltaics. Vacuum deposition perovskite thin films is advantageous as it allows the fabrication multilayer devices, fine control over thickness purity, can be upscaled to meet production needs. However, vacuum processing multicomponent (typically used achieve wide bandgaps) not straightforward, because one needs simultaneously several thermal sources...