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In this work, Molecular Beam Epitaxy (MBE) grown tunnel junctions (TJs) based on GaAs(Sb)(In) materials are experimentally and numerically studied. From simple GaAs TJs grown with various n-doping levels, we develop a semi-classical interband tunneling model able to quantify the magnitude of the tunneling current density, which shows that direct interband tunneling is the predominant tunneling mechanism...
Plasma treatment on polyurethane foams using an atmospheric pressure dielectric barrier discharge fed with helium and oxygen allows the preparation of an innovative material for heavy metals removal from water.
A novel low bandgap copolymer based on dithienosilole and pyridalthiadiazole (PDTSDTPT) is synthesized via Stille cross coupling. Its chemical, thermal, optical, electrical, and elctrochemical properties were investigated. We evidenced by UV-vis Spectroscopy that PDTSDTPT with modulated HOMO and LUMO energy levels exhibit higher absorptions over a larger fraction of the solar spectrum than the BT...
Under swift heavy ion irradiation, metal nanoparticles (NPs) embedded in silica (amorphous SiO2) show shape elongation toward the same direction parallel to the ion beam. Two candidate mechanisms, i.e., the deformation of transiently molten NPs by in-plane stress from the ion hammering and that guided by the underdense track cores, are compared and criticized. Finally, the first result of C60-ion...
We report on a top-down fabricated nanowire RFET platform based on SOI substrates. Due to shell oxide induced strain it features the best symmetry of n- and p-type ON-currents for equal gate voltages reported so far. By this feature complementary reconfigurable circuits are enabled.
Pyroelectric effect (PE) under humidity conditions from the −Z surface of Lithium Niobate (LiNbO3) crystal was investigated using a Fan shape microheater fabricated on the +Z surface of the crystal. Thermal analyses of the microheater were performed using COMSOL multiphysics and thermal sensor respectively. A resistive Aluminum (Al) sensor was integrated along the microheater in order to control the...
In this work samarium sulfide thin films have been deposited by using e-beam evaporation under H2S atmosphere. Optical and structural properties were studied in several environments. The stability in several environments allows further processing into piezoelectronic devices.
III-V nanowires gained general interest due to their unique properties such as high mobility, direct band gap and wide coverage of the solar spectrum. They provided advances in the fields of optoelectronics, nanoelectronics and energy applications. Recently, the focus has been shifted towards the self-catalyzed growth of these nanowires on silicon since gold produces detrimental mid-gap states in...
With the advancement of fabrication processes, bistable single domain nanomagnets are being exploited to design digital logic circuits. The fabricated circuits are however particularly sensitive to process variations and thermal noise. In this paper we exploit these weaknesses to design a true random number generator. The underlying idea is that the nanomagnet can be forced in a metastable state by...
Silicon nanowires have numerous potential applications, including transistors, memories, photovoltaics, biosensors and qubits [1]. Fabricating a nanowire with the required characteristics for a specific application, however, poses some challenges. For example, a major challenge is that, as the transistors dimensions are reduced, it is difficult to maintain a low off-current (Ioff) whilst simultaneously...
Nowadays there is a lot of interest for the development of smart and low cost radio frequency identification (RFID) tags to replace barcodes. To achieve this goal of the reduction of production cost the components of RFID tag should be built on flexible substrates. These substrates require the use of materials deposited at low temperature. Our microcrystalline silicon with his deposition temperature...
Core-shell nanowires are fundamental to several nanoscale device concepts. In this work, silicon and germanium nanowires were grown using the vapor-liquid-solid-method and modified with a thin silicon shell. The shell growth was thoroughly studied with respect to the crystallinity and the electrical properties. Furthermore, effects of certain post-annealing procedures are discussed. We show that by...
Nanostructures of silicon are becoming increasingly important as they may combine new opto-electronic features or devices with CMOS technology. This enables the integration of e.g. nanowire sensors with readout electronics or nanoscale LEDs grown directly on Si wafers. A problem here is that nanostructures are often fabricated using a bottom-up approach necessitating a second deposition step of random...
The transport in InAs nanowires is investigated at low temperatures. On wires with different n-type doping information on Rashba and Dresselhaus spin-orbit coupling is gained from weak antilocalization measurements. By using a short local gate quantum point contacts are formed, which show quantized conductance. From bias-depended measurements the g-factor is extracted for different subbands.
Band gap tailoring of 2D materials has been of interest for the past years. Using low-loss electron energy loss spectroscopy (EELS), in a scanning transmission electron microscope (STEM), it has been confirmed, following previous experimental (photoluminescence) and theoretical (DFT) studies, that the band gap of atomically thin nanoflakes of MoxW(1-x)S2 does shift with the alloying degree of the...
We demonstrated the high throughput production of ultra-thin SiNWs by the innovative Inductively Coupled Plasma (ICP) approach. Our investigations revealed that the vast majority (∼95%) of the ICP produced SiNWs grew according to the Oxide Assisted Growth mechanism, and the 5% through the Vapor-Liquid-Solid mechanism. These SiNWs present an intriguing internal nanostructure, that provides a new kind...
Size effects on metals and alloys that have external dimensions on the micron scale and smaller have been questioning the scientific community for several years. We have shown that these effects can be rationalized in terms of defects structure that is both sampled or altered during the fabrication processes and hindered by internal or surface effects when plastic flow has to develop.
Here we are using artificial neural network (ANN) model to predict the thermo mechanical properties of polycarbonate-organically modified MMT clay (pc-clay) nanocomposites. The data for designing the model was obtained from dynamic mechanical analyzer (DMA). The results were obtained at different temperature conditions (30–150°C) and compositions (1%, 3% and 5%) of clay. Transition points for pure...
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