A5012433900- Organic Electronics and Photovoltaics
- Thin-Film Transistor Technologies
- Advanced Memory and Neural Computing
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Electrohydrodynamics and Fluid Dynamics
- Carbon Nanotubes in Composites
- Neuroscience and Neural Engineering
- Molecular Junctions and Nanostructures
- Semiconductor materials and devices
- ZnO doping and properties
- Ga2O3 and related materials
- Electrowetting and Microfluidic Technologies
- Luminescence and Fluorescent Materials
- Perovskite Materials and Applications
- Nanofabrication and Lithography Techniques
- Gas Sensing Nanomaterials and Sensors
- Microwave and Dielectric Measurement Techniques
- Organic and Molecular Conductors Research
- Nanowire Synthesis and Applications
- Covalent Organic Framework Applications
- Supramolecular Self-Assembly in Materials
- Semiconductor Quantum Structures and Devices
Universidad de Murcia
2018-2025
University of Surrey
2010-2021
Institut de Ciència de Materials de Barcelona
2015-2017
Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine
2015-2017
Universitat Autònoma de Barcelona
2016
Florida International University
2009
In electronics, the field‐effect transistor (FET) is a crucial cornerstone and successful integration of this semiconductor device into circuit applications requires stable ideal electrical characteristics over wide range temperatures environments. Solution processing, using printing or coating techniques, has been explored to manufacture organic transistors (OFET) on flexible carriers, enabling radically novel electronics applications. Ideal characteristics, in materials, are typically only...
Ambient spray pyrolysis is used for the deposition of high quality polycrystalline ZnO films utilizing blends precursor solutions based on Zinc and Lithium acetates demonstration n-channel thin-film transistors with electron mobility exceeding 50 cm2/Vs (Figure).
Abstract The role of the substrate temperature on structural, optical, and electronic properties ZnO thin films deposited by spray pyrolysis using a zinc acetate precursor solution is reported. Analysis compound thermogravimentry differential scanning calorimetry indicates complete decomposition at around 350 °C. Film characterization Fourier Transform Infrared Spectroscopy (FTIR), photoluminescence spectroscopy (PL), ultraviolet–visible (UV–Vis) optical transmission suggests onset growth...
Here, we present the deposition of antimony-doped tin oxide thin films using ambient spray pyrolysis technique and demonstrate their implementation as transparent electrodes (anodes) in red, green blue organic light emitting diodes.
A physical description of low-field behavior a Schottky source-gated transistor (SGT) is outlined where carriers crossing the source barrier by thermionic emission are restricted JFET action in pinch-off region at drain end source. This mode operation leads to characteristics with low saturation voltage and high output impedance without need for field relief edge explains many SGT observed experimentally. 2-D device simulations lowering due effect show that transistors can be designed so...
A highly scalable solution shearing technique for processing an organic semiconductor and insulator has resulted in reproducible transistors on plastics.
Molecular organization plays an essential role in organic semiconductors since it determines the extent of intermolecular interactions that govern charge transport present all electronic applications. The benefits hydrogen bond-directed self-assembly on properties are demonstrated by comparing two analogous pyrrole-based, fused heptacyclic molecules. rationally designed synthesis these materials allows for inducing or preventing bonding. Strategically located bond donor and acceptor sites...
Abstract Charge transport in organic semiconductors is strongly dependent on the molecular orientation and packing, such that manipulation of this packing a proven technique for enhancing charge mobility transistors. However, quantitative measurements micrometre-scale structures are experimentally challenging. Several research groups have suggested polarised Raman spectroscopy as suitable these been able to partially characterise orientations using one or two parameters. Here we demonstrate...
Molecular design for the self-assembly of molecular materials.
An S-parameter extraction technique for broad-band characterization of transitions (discontinuities) at microwaves is presented. The developed S-parameters when a single transition between two transmission lines cannot be: (a) rigorously defined in full-wave solver, and consequently directly simulated, and/or (b) measured. presented includes procedure to obtain the break down frequency points thereby providing data broad bandwidth. accuracy validated on test examples.
Performance and stability between the top- bottom-gate field-effect transistor configurations are investigated in dual-gate structures consisting of same insulator gate materials. The transistors behave similarly for both modes with on/off ratio excess 105, subthreshold swing 0.5–1 V/decade, mobility 0.03–0.04 cm2/V s, retained over several months, fabrication, storage, characterization, performed ambient conditions.
Hydrogen bonding has been used to direct the solid state packing of four polyheteroaromatic molecules. The correlation between structure and charge mobility evaluated in OFETs.
Large-area electronics require cost-effective yet precise patterning of electrodes. We demonstrate a simple electrode technique capable micron-scale gap formation, that allows the larger variety metals than current portfolio jettable metallic ink comprises and does not high-temperature sintering step. However, this method can produce large variations in size resulting inconsistent irreproducible transistor drain current. propose source-gated transistors (SGTs) are well suited to technique,...
Abstract A switchable electrode, which relies on an indium‐tin oxide conductive substrate coated with a self‐assembled monolayer terminated anthraquinone group (AQ), is reported as electrowetting system. AQ electrochemical features confer the capability of yielding significant modulation surface wettability high 26° when its redox state switched. Hence, array planar electrodes for droplets actuation fabricated and integrated in microfluidic device to perform mixing dispensing sub‐nanoliter...
High ionisation potential polymer transistors with unavoidable Schottky contacts are used to provide very stable and low-current operation a low saturation voltage of 2 V even thick gate dielectric due source-gated transistor design.
A comparative study of carbazolocarbazole isomers and their respective N-alkyl derivatives confirms the good performance carbazolo[2,1-a]carbazole as hole-transporting material in organic field effect transistors. The azaphenacene structure this molecule forms a dense packing promoted by particularly short longitudinal shifts between molecules establishing face-to-face edge-to-face interactions. Computational calculations have determined an almost isotropic 2D transport environment within...
We have fabricated organic bottom-contact top-gate field-effect transistors with an indenofluorene-phenanthrene co-polymer semiconductor, exhibiting ON/OFF ratio of 107 and uncommonly high mobility for amorphous conjugated polymer up to 0.3 cm2/Vs. Lack crystallinity in this material is indicated by atomic force microscopy, grazing incidence wide angle X-ray scattering, differential scanning calorimetry data. Nevertheless, fitting transistor data the Gaussian disorder model gives low...
Fabrication techniques such as laser patterning offer excellent potential for low cost and large area device fabrication. Conductive polymers can be used to replace expensive metallic inks silver gold nanoparticles printing technology. Electrical conductivity of the improved by blending with carbon nanotubes. In this work, formulations acid functionalized multiwalled nanotubes (f-MWCNTs) poly(ethylenedioxythiophene) [PEDOT]:polystyrene sulphonate [PSS] were processed, thin films prepared on...
Self-assembly is a useful tool in Chemistry for the development of organized supramolecular systems stabilized by non-covalent interactions. [1] The rational design organic molecules that suitably integrate different interacting sites into their structure becomes an attractive approach to control molecular arrangement exploiting driving force those [2] With this objective mind, we have synthesized series π-conjugated incorporate 7-azaindole unit as building block induce self-assembly solid...