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In situ Ga-catalyzed AlGaAs nanostructures have been grown by MOVPE. The effect of growth temperature on the shape, size, tapering, and spatial distribution of nanostructures has been investigated using the FESEM technique. Micro-PL measurements have been conducted to analyze the optical quality of the nanostructures. Aluminum composition of around 13% has been estimated by multiple peak-fitting of...
Water droplets actuated by alternating fields mostly show axisymmetric modes. Under certain actuation conditions, non-axisymmetric resonance modes grow at the cost of axisymmetric modes. Using high speed imaging, we studied the growth dynamics of these non-axisymmetric modes of water droplets actuated by AC electrowetting-on-dielectric (EWOD). It was observed that at certain frequencies the non-axisymmetric...
Pd/ZnO Nanowires (NWs)-based Schottky diodes have been fabricated on Zn seed layer-coated n-Si substrates by a simple thermal evaporation method. The surface morphology and crystalline structure of ZnO NWs have been investigated by FESEM and XRD. The Pd/ZnO NWs Schottky diodes exhibit a typical non-linear rectifying behavior with excellent rectification ratio (IF/IR) ∼ 7561 at ± 2 V, barrier height...
In this paper, we have demonstrated the performance analysis of a planar junctionless (JL) silicon-oxidenitride-oxide-silicon (SONOS) memory cell implemented on the bulk and silicon-on-insulator (SOI) substrate wafer. Both cells are simulated using extensive two dimensional device simulator and compared on the basis of improved memory characteristics. The JL SOI SONOS exhibits larger memory window...
Wire Bonding is a well known method used for interconnecting integrated circuit (IC) die and the leads of its package. In this paper, the effect of current on the temperature of the gold (Au) ribbon used for wire bonding in the packaging of power device is presented. Infrared spectrometer study and direct thin film Pt temperature sensor analysis were used to analyze the temperature variations in gold...
Electronic devices are finding increasing application as biosensors for the label-free detection of biomolecules. These biosensors offer the advantage of fast detection and compatibility with existing CMOS processes that enable rapid commercialization, and achieve very low detection limits. A biosensor's sensitivity is one of the main factors determining its performance. The application of emerging...
The present work focusses on thin film transistor (TFT) devices with polycrystalline and amorphous Indium-Gallium-Zinc-Oxide (IGZO) thin films fabricated using solution processing. Since it is easier to vary composition through solution processing, we have investigated suitability of various chemical compositions for TFT applications. We have found that a common composition In:Ga:Zn::1:1:1 used in...
Surface plasmon-enhanced near-band-edge (NBE) emission of ZnO nanorods (NRs) array was studied after growing on ultra-thin Ag film of mass thickness 1 nm. Prior to the growth, Ag films were annealed at 100 and 250 °C. Annealing at 100 °C lead to the formation of smaller size of Ag nanoparticles with higher particle number density facilitating the vertical growth of higher density of ZnO NRs with high...
This paper investigates the effects of fringing field arising out of high-k (dielectric constant) gate insulator on the device performance of a p-channel double-gate junctionless transistor (p-DGJLT). The overall device performance of a p-DGJLT is degraded with such fringing field. This behavior is similar to its n-channel counterpart of similar dimension. The effects of spacers on both sides of high-k...
We investigated the effect of Ga flux and plasma power on the homoepitaxial growth of GaN epitaxial films by Molecular Beam Epitaxy (MBE) on MOCVD-grown GaN templates on c-sapphire substrates. The grown GaN films were characterized by several techniques to assess their structural and morphological properties. The surface morphology, dislocation densities and crystalline quality were found to be contingent...
In this paper, we report optical and mechanical properties of low temperature plasma enhanced chemical vapor-deposited (PECVD) amorphous hydrogenated silicon carbide (a-SiC:H) thin films. Initial screening of this process using hydrogen-dilution was performed with a two-level, three-parameter design of experiments (DOE) with eight samples. In this process regime, it was determined that the main parameters...
In this article, we propose the formation of GaN nanowall morphology on Si (111) surface by varying nitrogen flux from 2, 4.5 and 6sccm in PA-MBE growth. The optical, structural and electrical properties of these films are investigated. Cathodo-luminescence data suggests that the nanowall network grown at 6sccm show high optical emission and high crystalline quality. The current-voltage (I-V) characteristics...
In this paper, we address a simplified physics-based analytical model for the temperature — as well as the sheet-concentration-dependent resistivity of the free-standing monolayer graphene sheet. The analytical solution is achieved through the formulation of the sheet-concentration as the function of the external current. To determine the temperature-and sheet-concentration-dependent resistivity of...
Superhydrophobic surfaces show extraordinary water-repellent properties with low drag for fluid flow due to reduced liquid-solid contact area. Due to high contact angle and low contact angle hysteresis these surfaces also show self-cleaning effect. In nature different plants and leaves, such as Lotus leaf and Rose petals show superhydrophobic behaviour due to wax coated micro/nano hierarchical structures...
High thermal stability is a requirement for thin films explored for solar cell applications. In this paper the thermal stability of single layer AlOX film deposited by pulsed — DC (p-DC) reactive sputter technique and a stack of AlOX/SiNX for surface passivation of p — type crystalline silicon (c-Si) is compared. The SiNX film of thickness of 70 nm, was deposited using inductively coupled plasma (ICP)...
The effect of size on the scattering properties of silica nanoparticles on glass has been presented here. Silica nanoparticles of two different sizes (∼50 nm and ∼300 nm diameter) have been synthesized by a modified Stober technique and applied by spin coating on glass surface. Scattering properties of the nanoparticles have been studied experimentally. It is seen that larger nanoparticles have a...
This paper investigates influence of material engineering on the performance parameter of (Cylindrical Surrounding Double Gate) CSDG MOSFET for improvement in performance. CSDG MOSFETs are evaluated for various parameters such as surface potential, electric field, drain on current, off current, transconductance, cut-off frequency and total gate input capacitance. The comparison of the gate material...
Organic thin-film transistors (OTFTs) are making significant inroads into various large-area applications. Organic materials provide a low-cost alternative to silicon in the electronics industry as they can be fabricated at low temperatures and with high throughput on a wide range of unconventional substrates, such as glass, plastic, fabric and paper. This paper presents a simple 2D simulation study...
In this work, boric acid powder solution has been used as a dopant source for optimizing emitter sheet resistance values corresponding to temperature range 850°–900°C. High purity (99.999%), non-toxic and low-cost boron diffusion is found to be suitable for p or p+ emitters with minimum diffusion-induced defects. Formation of a boron-rich layer, which is considered as a major problem in B-diffusion...
Surface-Evolver is an interactive program used to study surface profiles that are influenced by surface tension. The tool is an open source software, developed by Professor Kenneth Brakke in Susquehanna University, USA. Solder based self assembled (SBSA) 3D structure was studied previously via experiments using lithography, deposition, wet etching, and dip soldering methods. SBSA 3D structure has...
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