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A laser generation and optical difference detection method of surface acoustic waves is used for characterizing elastic constants of thin films deposited on substrates. The film/substrate samples are prepared by a RF magnetron sputtering technique. Teflon-like films, deposited on three kinds of substrates, silicone plates, glass and copper plates, have been studied and the related parameters have...
The electrochemical study of certain azulene bis azo derivatives meta or para substituted is connected to the potential applications (enhanced NLO coefficients [1] and electrochromic behaviour) of this type of compounds. New compounds were studied by cyclic (CV) and differential pulse voltammetry (DPV), in TBABF4 0.1 M, CH3CN or CH3CHCl2 in order to find some rules regarding the influence of substituents...
III-nitride electron devices are attracting considerable attention for future wireless communication equipments and power electronics systems. This paper gives an overview on the state-of-the-art performance of AlGaN/GaN heterojunction FETs and describes some key issues concerning further improvements in the device performance. Focus is also on the future perspectives of III-nitride-based transistor...
The current density-voltage (J-V) and capacitance voltage (C-V) characteristics of a p-n heterojunction device are studied. The device was fabricated by depositing phosphorus (P) doped carbon (C) thin film on p-type silicon (Si) substrate by pulsed laser deposition (PLD) technique at room temperature. Camphor (C10H16O), a natural source, was used as the starting precursor for the carbon layer of the...
Photoresponse of nitrogen and phosphorous doped n-C/p-Si heterostructure have been studied. Camphor (C10H16O) was used as starting precursor material in both cases. Phosphorous was doped in varying amounts (1%-7% by mass) and Nitrogen was doped in gas phase with varying partial pressure in the range from 0.3 to 50 mTorr. The doped carbon films were deposited on Silicon substrates by pulsed laser deposition...
We have investigated numerically the optimization of newly designed Pb(Zr,Ti)O3 (PZT) actuated segmented μ-mirror device used particularly in bio-medical application for adaptive optics. By performing advanced finite element modeling that includes thermo-mechanical and piezoelectric simulations an optimal μ-mirror device design is suggested maintaining its structural integrity intact.
Reliability of thin metal films and multilayers with layer thickness ranging from micrometers to nanometers is becoming more and more important not only due to the rapid development of micro/nano technology, but also because of the demands for the fundamental research interests in small scale materials. In this paper, we will introduce the state-of-the-art progress in evaluation of fatigue reliability...
We obtained blue photoluminescence from tantalum oxide films deposited by radio-frequency sputtering after annealing. Intense photoluminescence having a peak wavelength of around 430 nm was observed from a sample annealed at 600degC for 20 min. Tantalum oxide films that emit blue light can be useful as materials for novel active optical devices utilizing Ta2O5/SiO2 multilayered photonic crystals.
A new model to understand the origin of the dipole formed at high-k/SiO2 interface is presented. In our model, the areal density difference of oxygen atoms at high-k/SiO2 interface is considered as the cause of the dipole. On the basis of our model it is possible to predict the dipole direction and its magnitude for the candidate gate dielectrics, including ones so far not experimentally reported...
Nanocluster Carbon thin films have been seen as an alternative semiconducting layer to a-Si:H. Amorphous and polycrystalline hydrogenated silicon are used as an active channel layer for the thin film transistors (TFTs) for long time. But these materials are fabricated at high temperatures. In this paper, we describe nanocluster carbon thin films as alternative materials for the TFT device application...
A new method has been developed to allow a localized deposition of different sensitive materials on the surface of capacitive micromachined ultrasonic transducers (CMUTs). It is based on a 2-layer preparation. In the first step, nanoparticles provide a bottom layer which defines the acoustic properties of the device, while different supermolecules are dispensed onto selected areas of the nanoparticle...
The aim of this work is to investigate the amorphous-to-crystalline phase transformation process in Ge2Sb2Te5 ternary alloys. The experiments were carried out using impedance and X-ray diffraction measurements. The results have shown that the crystallization process in an amorphous Ge2Sb2Te5 alloy starts from nuclei, which appear below Tc and which were identified as the crystalline Ge1Sb4Te7. As...
Film bulk acoustic resonator (FBAR) was fabricated using AlN(0002) film. We achieved the high oriented AlN(0002) film through the metal-organic chemical vapor deposition (MOCVD) method on Ru/Ta bottom electrode. But thermal stress of AlN film was a problem in the high temperature MOCVD process over 1000degC. To reduce the thermal stress of AlN film, the low temperature AlN film growth was needed....
The preparation of a high-strength and highly transparent thin-film nanocomposites via layer-by-layer assembly technique from poly(vinyl alcohol) (PVA) and Na+-montmorillonite clay nanosheets is reported here. We show that a high density of weak bonding interactions between the polymer and the clay particles: hydrogen, dipole-induced dipole, and van der Waals undergoing break-reform deformations,...
The paper reports design, fabrication and simulation of a polymeric Bragg grating rib waveguide device using solvent assisted microcontact molding (SAMIM) through a single mold.
Cu(In1-xGax)Se2 (CIGS)-based solar cells have emerged as one of the most promising candidates for high-efficiency low-cost thin-film solar cells, and a significant improvement in solar cell performance has been reported with conversion efficiencies as high as eta=19.9%, though the efficiencies of commercial modules are limited to eta=11-12%. In Japan, the efficiency goal for 2030 is set to be eta=25%...
In this paper, using a polyfluorene derivative, increased fluorescence quantum efficiency and reduced red-shift in the film form of polymer nanoparticle luminophors is achieved, when compared to directly spin coated polymer thin films.
Piezoelectric thin film has been used to visualize back surface flaws in plates. If the plate with a surface flaw is deformed, the strain distribution appears on the other surface reflecting the location and the shape of the flaw. Such surface strain distribution can be transformed into the electric potential distribution on the piezoelectric film mounted on the plate surface. The purpose of this...
In this article, copper germanate (CuGeO3) mixed noble metal pervoskite oxide was prepared by solid-state synthesis process first time. XRD confirms the orthorhombic pervoskite phase of material. Thick films of CG were prepared by screen-printing technique. The gas sensing performance of thick films were tested for various gases. It showed maximum sensitivity to H2S gas at 50degC for less than 10ppm...
Bulk heterojunction organic solar cells based on conjugated polymers and soluble fullerene derivatives have been intensively studied due to their simple device structure, easy thin-film casting process, low fabrication cost, and high power conversion efficiency. To further enhance the efficiency, it is of paramount importance to develop new p-type polymeric semiconductors with high charge mobility...
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