A5090523040- Thin-Film Transistor Technologies
- ZnO doping and properties
- Transition Metal Oxide Nanomaterials
- Gas Sensing Nanomaterials and Sensors
- Silicon Nanostructures and Photoluminescence
- Silicon and Solar Cell Technologies
- Semiconductor materials and devices
- Copper-based nanomaterials and applications
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Biosensors and Analytical Detection
- Surface Roughness and Optical Measurements
- Astronomical Observations and Instrumentation
- Ga2O3 and related materials
- CCD and CMOS Imaging Sensors
- Advanced Memory and Neural Computing
- Advanced biosensing and bioanalysis techniques
- Nanowire Synthesis and Applications
- Electronic and Structural Properties of Oxides
- Analytical Chemistry and Sensors
- Chalcogenide Semiconductor Thin Films
- Advanced Photocatalysis Techniques
- Perovskite Materials and Applications
- TiO2 Photocatalysis and Solar Cells
- Quantum Dots Synthesis And Properties
Universidade Nova de Lisboa
2016-2025
University of Lisbon
2015-2024
Uninova
2014-2024
Weatherford College
2023
SINTEF
2022
SINTEF Industry
2022
University of Oslo
2022
Madurai Kamaraj University
2022
Madan Parque
2022
Liverpool John Moores University
2022
Fully transparent thin-film transistors (TFTs) are produced at room temperature by radiofrequency magnetron sputtering. Measuring the drain current (IDS) as a function of voltage (VDS) different gate voltages (VGS) shows TFTs possess "hard saturation" with on-currents about 0.2 mA (see Figure) and saturation mobilities 20 cm2 V–1 s–1. The optical electrical properties compatibility fabrication process low-cost plastic substrates show promise for invisible flexible electronic circuits.
We report high-performance ZnO thin-film transistor (ZnO-TFT) fabricated by rf magnetron sputtering at room temperature with a bottom gate configuration. The ZnO-TFT operates in the enhancement mode threshold voltage of 19V, saturation mobility 27cm2∕Vs, swing 1.39V∕decade and an on/off ratio 3×105. presents average optical transmission (including glass substrate) 80% visible part spectrum. combination transparency, high mobility, room-temperature processing makes very promising low-cost...
Abstract Laser‐induced graphene (LIG) can be obtained by irradiation of a polymer laser source. The present work demonstrates that it is possible to obtain this kind material using an ultraviolet instead the typical infrared Using approach, fourfold decrease in penetration depth (5 µm) achieved, while spatial resolution doubled. Electromechanical strain LIG sensors are patterned polyimide substrates with different thicknesses and their performance strain, bending, force inputs measured. A...
Oxide electronic materials provide a plethora of possible applications and offer ample opportunity for scientists to probe into some the exciting intriguing phenomena exhibited by oxide systems interfaces. In addition already diverse spectrum properties, nanoscale form oxides provides new dimension hitherto unknown due increased surface-to-volume ratio.
P-type thin-film transistors (TFTs) using room temperature sputtered SnOx (x<2) as a transparent oxide semiconductor have been produced. The films show p-type conduction presenting polycrystalline structure composed with mixture of tetragonal β-Sn and α-SnOx phases, after annealing at 200 °C. These exhibit hole carrier concentration in the range ≈1016–1018 cm−3; electrical resistivity between 101–102 Ω cm; Hall mobility around 4.8 cm2/V s; optical band gap 2.8 eV; average...
Giant photovoltaic effect due to bulk observed in multiferroic BiFeO3 thin films has triggered a renewed interest on photoferroelectric materials for applications. Tremendous advance been done improve power conversion efficiency (up up 8.1%) photoferroelectrics via absorption increase using narrow bandgap ferroelectrics. Other strategies, as it is the more efficient use of ferroelectric internal electric field, are ongoing. Moreover, by-product, several progress have also achieved...
Human health, environmental protection and safety are just a few examples of humankind's current main concerns, that drive the scientific community to develop sensors able monitor precisely provide alerts possible harm in real time. Over years, semiconductor metal oxide-based materials have been extensively employed as several applications. They particular interest at nanometer scale, since it is widely known smaller crystallite size enhances sensor's performance. Moreover, these highly...
A complementary metal oxide semiconductor (CMOS) device is described. The based on n-(In-Ga-Zn-O) and p-type (SnOx) active semiconductors uses a transparent conductive (In-Zn-O) as gate electrode that sits flexible, recyclable paper substrate simultaneously the dielectric.
Cotton-based nanocrystalline cellulose (NCC), also known as nanopaper, one of the major sources renewable materials, is a promising substrate and component for producing low cost fully recyclable flexible paper electronic devices systems due to its properties (lightweight, stiffness, non-toxicity, transparency, thermal expansion, gas impermeability improved mechanical properties).
There is a strong interest in the use of biopolymers electronic and biomedical industries, mainly towards low-cost applications. The possibility developing entirely new kinds products based on cellulose current interest, order to enhance add functionalities conventional paper-based products. We present our results development microfluidics for molecular diagnostic testing. Paper properties were evaluated compared nitrocellulose, most commonly used material lateral flow other rapid tests....
The ability to synthesize laser-induced graphene (LIG) on cellulosic materials such as paper opens the door a wide range of potential applications, from consumer electronics biomonitoring. In this work, strain and bending sensors fabricated by irradiation regular filter with CO2 laser are presented. A systematic study influence different process parameters conversion cellulose fibers into LIG is undertaken, analyzing resulting morphology, structure, conductivity, surface chemistry. obtained...
Opto-electronics on/with paper is fostering a novel generation of flexible and recyclable devices for sunlight harvesting intelligent optical sensing.
Covid is giving us many lessons among which one must be to realize that this the time act for sustainable future. The smart world around has made it inevitable have an alarming situation regarding uncontrolled growth of waste products such as plastic and electronic wastes. Both are immense threats health human, wildlife environment, eventually affect societal economic structures evident from recent Covid-crisis. proper management these wastes innovating ideas new technologies need hour....
Polymer material provides significant advantages over the conventional inorganic material-based electronics due to its attractive features including miniaturized dimension and feasible improvisations in physical properties through molecular design chemical synthesis. In particular, conjugate polymers are of great interest because their ability control energy gap electronegativity that has made possible synthesis conducting with a range ionization potentials electron affinities. Polyaniline...
Since the discovery of laser-induced graphene (LIG), significant advances have been made to obtain green LIG (gLIG) from abundant, eco-friendly, natural, and organic renewable bio-based carbon sources. Recently, some sustainable cost-effective electronic devices designed with gLIG, resulting in diverse solutions environmental impact caused by waste (e-waste). However, there are still several challenges that must be addressed regarding widespread market implementation gLIG-based products,...
Direct Laser Writing (DLW) has been increasingly selected as a microfabrication route for efficient, cost-effective, high-resolution material synthesis and conversion. Concurrently, lasers participate in the patterning assembly of functional geometries several fields application, which electronics stand out. In this review, recent advances strategies based on DLW are surveyed outlined, laser growth strategies. First, main parameters influencing transformation mechanisms summarized, aimed at...
In this letter, we report for the first time use of a sheet cellulose-fiber-based paper as dielectric layer used in oxide-based semiconductor thin-film field-effect transistors (FETs). new approach, are using an ldquointerstraterdquo structure since device is built on both sides cellulose sheet. Such hybrid FETs present excellent operating characteristics such high channel saturation mobility,(> 30 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...