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We have prepared new TiO2 paste and carbon counter electrodes for the large area and low cost DSSC manufacturing applications. The carbon counter electrodes were prepared from commercial carbon paste in different sintering temperatures. The photovoltaic properties of the DSSCs made of TiO2 paste based photoanode and carbon counter electrodes showed that the sintering temperature of counter electrode...
The goal of this work was to show ageing of capacitors with metalized polypropylene film by the sinusoidal and non-sinusoidal voltage and to find how the shape of the voltage waveform influences the ageing rate. A special device, which makes forming of the voltage of the fundamental and selected higher harmonic component possible, was used as a source for non-sinusoidal load. Capacitors with values...
In this paper, transient current characteristics for fluorinated parylene (PA-HT) films are investigated in the temperature range between 200 °C and 350 °C as a function of the electric field, material thickness and electrode polarity using a non symmetrical metal/PA-HT/metal structure. In the transient domain, it is found that the decrease in the current during the bias time is mainly due to dipole...
This paper reports depositions of double layers of thick Pb(Zr,Ti)O3 films in order to realize piezoelectric bimorph structures for MEMS(micro electro-mechanical systems) applications. The PZT/PZT bimorph with the total thickness of 5.4 µm, deposited by magnetron sputtering system, is much thicker than conventionally reported ones. The optimization of the sputtering conditions and electrode structures...
In this study, formic acid combined Pt catalyst in situ pretreatment process was developed for low temperature Cu/Cu direct bonding. Cu film surface was treated by formic acid without/with Pt as catalyst at 200°C for 10min to reduce Cu surface oxide. Through XPS analysis, it is found that, with Pt as catalyst, formic acid reduction effect on Cu film surface is better than that of formic acid treatment...
With the rapid development of superconducting technology, the electrical characteristics of insulating materials at cryogenic temperature has become an important factor which influences the operating performance and reliability and has attracted extensive attention. This paper mainly deals with a new test system which is used to produce a vacuum cryogenic environment for studying the DC insulation...
A multi-walled carbon nanotube (MWCNT) sheet electrode for a transparent touch screen has been proposed and reported in this paper. The MWCNT sheet is directly spun out from well-aligned CNT forest and exhibits excellent piezoresistive sensing that can be utilized for a touch panel screen. Fabrication of the MWCNT sheet electrode is very simple and requires only a one step process, which MWCNT sheet...
This paper describes a suppression of transverse-mode spurious responses for zero temperature coefficient of frequency (TCF) surface acoustic wave (SAW) resonator on a SiO2/Al/LiNbO3 structure. We investigated to use thinning of SiO2 on the dummy electrodes and studied how the transverse-mode responses change with remaining SiO2 thickness h on the dummy electrode region. As the results, we could realize...
We investigated the characteristics of amorphous indium gallium zinc oxide (a-IGZO) thin-film transistors (TFTs) whose channel was deposited with different oxygen flows, and were annealed at different annealing temperatures and ambient. This study indicates that annealing in forming gas and oxygen ambient indeed improve the transfer characteristics, resulting in better threshold voltage (Vth) and...
In this study V2O4-PEPC composite based temperature sensors were designed and fabricated by drop-casting the blend of V2O4-PEPC microcomposite into thin films between the gap of preliminary deposited electrodes on a glass substrates. The blend was prepared by mixing 10 wt.% vanadium oxide (V2O4) micro-powder and 2 wt.% poly-N-epoxypropylcarbazole (PEPC) in 1 ml of benzol. The thickness of the V2O4...
ZrO2-based resistive random access memory devices composed of a thin Cu doped ZrO2 film sandwiched between an oxidizable top electrode and an inert bottom electrode are fabricated by e-beam evaporation at room temperature. The devices show reproducible nonpolar resistive switching. The formation and annihilation of localized conductive filaments is suggested to be responsible for the resistive switching...
A SiO2/Al/LiNbO3 structure has a large electromechanical coupling factor (K2) and good temperature coefficient of frequency (TCF) for the UMTS Band I application. However, the SiO2/Al/LiNbO3 structure also supports two unwanted spurious responses; one is caused by the Rayleigh-mode and the other by the transverse-mode. As the authors have previously discussed, the Rayleigh-mode spurious response can...
Conventional anodic aluminum oxide (AAO) process was performed in low electrolytic temperature and high purity aluminum (Al) foil. In this article, pulse reverse voltage was applied to commercial purity (99%) and high purity (99.997%) Al foils at room temperature to form AAO. DC method was also used as a reference. The pulse AAO method provides advantages not only the reduced process complexity and...
Changes in the dielectric breakdown field of polyimide (PI) films have been studied from 25 to 400??C under dc ramps. Both the area (from 0.0707 to 19.635 mm2) and thickness (from 1.4 to 6.7 ??m) dependences of the dielectric breakdown field have been carried out using the Weibull distribution function. The 63%-breakdown field value (i.e. the ??-scale parameter) of PI shows a decrease with increasing...
The exhibiting electrical properties of ferroelectric thin films usually are influenced by the electrode materials. In this paper, platinum (Pt), gold (Au) are selected as the top electrode materials for 0.6(Bi0.85La0.15)FeO3-0.4PbTiO3 (BLFO-PT) thin films. The Pt and Au electrodes were prepared by sputtering technique and annealed at 350degC. The effect of the top electrode materials is analyzed...
A general numerical scheme based on Landau-Devonshire free energy is applied for ferroelectric thin films undergoing a first order phase transition to describe the influence of imperfect surface layers and depolarization field on profile of polarization P(z) and phase transition temperature. It is known that the physical properties of thin films are significantly different from those of bulk ferroelectrics...
The wideband CDMA (W-CDMA) system at 2 GHz has a wide duplex gap between transmitting (Tx) and receiving (Rx) bands. When developing a small-sized SAW duplexer for this application, one needs a substrate with a large electromechanical coupling factor (K2) and good temperature coefficient of frequency (TCF). An SiO2/Al/LiNbO3 structure meets these two requirements, it also supports a large electromechanical...
The time resolved fast pulsed electro-acoustic (PEA) method is used to investigate the space charge characteristics in an additive-free poly(propylene-ethylene) (PPE) copolymer in film form. The 190 mum-thick films were submitted to DC and low frequency AC stress for various durations at various temperatures. Upper electrode (UE) and lower electrodes (LE) are semi-conductive polyethylene and aluminum,...
Recently, in our lab we have performed some systemic studies on polarization fatigue in ferroelectric polymers and four possible contributing factors (applied voltages, operation temperature, film crystallinity and electrode structure) are characterized by a homemade sawyer-Tower circuit. All fatigue phenomena observed in these experiments seem to imply the effect of space charges, which are injected...
Polarities of plasma charging damage in n- and p-channel MOSFETs with Hf-based high-k gate stack (HfAlOx/SiO2) were studied for two different plasma sources (Ar-and Cl-based gas mixtures), and found to depend on plasma conditions, in contrast to those with conventional SiO2. For Ar-plasma, which was confirmed to induce a larger charging damage, both n- and p-ch MOSFETs with high-k gate stacks suffer...
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