Thickness Of Dielectric Barrier Research Articles

Влияние параметров барьера и приложенного напряжения на характеристики импульсного поверхностного разряда

The results from an experimental study of impulse surface discharge occurring in an electrode system containing a dielectric plate are presented. On one of its sides, the plate had a corona-producing electrode made of 50 mm thick copper foil grounded through a current shunt for measuring the discharge current. On its other side, the plate had a high-voltage electrode, to which the voltage from a pulse generator was applied. The article presents the results from measurements of the initial voltage and the sizes of the surface discharge area in air when applying single voltage pulses with different pulse front steepness in the range 0,1–3,4 kV/ms and amplitude in the range 7–15 kV. The measurements were carried out for different dielectric barrier materials with the e values from 2 to 35. The dielectric barrier thickness was 0,9–1,8 mm. The study results have shown that the initial surface discharge ignition voltage depends essentially on the voltage pulse parameters, whereas the barrier characteristics have a weaker effect on this voltage. It has been determined that the discharge has different discharge zone length and different structure depending on the dielectric barrier properties and applied voltage parameters. The streamer zone sizes decrease with increasing the barrier material e value at the same voltage pulse steepness and increase with increasing the steepness for each barrier material. The data obtained for a wide range of external conditions can be used in numerical modeling of discharge.

Numerical Investigation on the Effects of Dielectric Barrier on a Nanosecond Pulsed Surface Dielectric Barrier Discharge.

In order to understand the impacts of dielectric barrier on the discharge characteristics of a nanosecond pulsed surface dielectric barrier discharge (NS-DBD), the effects of dielectric constant and dielectric barrier thickness are numerically investigated by using a three-equation drift–diffusion model with a 4-species 4-reaction air chemistry. When the dielectric constant increases, while the dielectric barrier thickness is fixed, the streamer propagation speed (V), the maximum streamer length (L), the discharge energy (), and the gas heating () of a pulse increase, but the plasma sheath thickness (h), the fast gas heating efficiency , and the charge densities on the wall surface decrease. When the dielectric barrier thickness increases, while the dielectric constant is fixed, V, L, , and of a pulse decrease, but h, , and the charge densities on the wall surface increase. It can be concluded that the increase of the dielectric constant or the decrease of the dielectric barrier thickness results in the increase of the capacitance of the dielectric barrier, which enhances the discharge intensity. Increasing the dielectric constant and thinning the dielectric barrier layer improve the performance of the NS-DBD actuators.

Breakdown voltage for surface dielectric barrier discharge ignition in atmospheric air

Breakdown voltage for surface dielectric barrier discharge ignition in atmospheric air has been measured for different parameters of the dielectric barrier, exposed electrode mounting, and supply voltage frequency. The analytical model of the discharge onset has been developed. It reveals that the discharge breakdown voltage is proportional to the square root of the dielectric barrier thickness and weakly depends on dielectric relative permittivity. The trajectory of discharge breakdown is managed mainly by gas properties and its density; it does not depend on dielectric barrier parameters and the breakdown voltage value. The analytical solution is in good agreement with the obtained experimental data and indicates the validity of the 2D approach for the breakdown process in the case of discharge between the strip and flat electrodes separated by a dielectric barrier.

Bipolar resistive switching in Si/Ag nanostructures

Resistive switching devices are being intensively studied aiming a large number of promising applications such as nonvolatile memories, artificial neural networks and sensors. Here, we show nanoscale bipolar resistive switching in Pt/Si/Ag/TiW structures, with a dielectric barrier thickness of 20nm. The observed phenomenon is based on the formation/rupture of metallic Ag filaments in the otherwise insulating Si host material. No electroforming process was required to achieve resistive switching. We obtained average values of 0.23V and −0.24V for the Set and Reset voltages, respectively. The stability of the switching was observed for over 100 cycles, together with a clear separation of the ON (103Ω) and OFF (102Ω) states. Furthermore, the influence of the Set current compliance on the ON resistance, resistances ratio and Set/Reset voltages percentage variation was also studied.

A Low-Frequency Dielectric Barrier Discharge System Design for Textile Treatment

The ultimate goal of the conducted research was to design and test a simplified and energy efficient low-frequency dielectric barrier discharge reactor for the textile processing industry. For this purpose, a 50 Hz AC source and a variac were used to ionize the ambient air column between two asymmetric conductive electrodes separated by a dielectric layer between them. It was observed that the discharge system with such electrode configuration undergoes an electrical breakdown with large number of shortly lived microdischarges indicating the effectiveness of the model. The variational trend in discharge power and transported charge as a function of AC input voltage and dielectric barrier thickness were also studied in this work. In addition, the spectroscopic investigations were carried out on electron number density and electron temperature as a function of barrier thickness, AC input voltage, and interelectrode air gap. A significant influence of the system input parameters on discharge properties was noticed in these investigations.

INFLUENCE OF SUBSTRATE THICKNESS ON DIFFUSE COPLANAR SURFACE BARRIER DISCHARGE PROPERTIES

In presented work the influence of dielectric barrier thickness on the parameters of Diffuse Coplanar Surface Barrier Discharge was investigated. The discharge was operated at atmospheric pressure laboratory air. The electrical parameters of the system were studied both experimentally and using numerical simulations. The discharge pattern was studied as well using intensified CCD camera.

Pin Hole Discharge Creation in Na2SO4 Water Solutions

This work deals with the diaphragm discharge generated in water solutions containing Na2SO4 as a supporting electrolyte. The solution conductivity was varied in the range of 270 ÷ 750 µScm-1. The batch plasma reactor with volume of 100 ml was divided into two electrode spaces by the Shapal-MTM ceramics dielectric barrier with a pin-hole (diameter of 0.6 mm). Three variable barrier thicknesses (0.3; 0.7 and 1.5 mm) and non-pulsed DC voltage up to 2 kV were used for the discharge creation. Each of the current–voltage characteristic can be divided into three parts: electrolysis, bubble formation and discharge operation. The experimental results showed that the discharge ignition moment in the pin-hole was significantly dependent on the dielectric diaphragm thickness. Breakdown voltage increases with the increase of the dielectric barrier thickness.

On the Impact of Through-Silicon-Via-Induced Stress on 65-nm CMOS Devices

Electrical evaluation of the impact of through-silicon via (TSV)-induced stress on 65-nm MOSFETs is presented in this letter. MOSFETs with varying widths and lengths were laid out at a minimum distance of 1.2 up to 16 μm from TSVs at different orientations. The TSV diameter, height, and dielectric barrier thickness are 8, 60, and 1 μm, respectively. Measured change of saturation current (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</sub> ) of devices at the minimum distance is less than 4% for all the cases. The reliability of the devices was also investigated up to 1000 thermal cycles, between -55°C and 125 °C. No significant change in MOSFET performance is observed in comparison with the measurements before thermal cycling.

플라즈마 유동제어를 위한 DBD 플라즈마 액츄에이터의 설계변수에 따른 특성 연구

Characteristics of DBD(Dielectric Barrier Discharge) plasma actuator as design parameters were investigated for plasma flow control. Flow velocity and power consumption of the DBD plasma actuator were measured according to the design parameters such as discharge voltage and frequency, gap, width and length of electrode, and the thickness of dielectric barrier. The flow velocity and power consumption increased as the discharge voltage and frequency increased. As the electrode gap increased, the flow velocity increased with decreasing the power consumption, whereas high voltage was required for the plasma discharge. The flow velocity increased as the upper-electrode width decreased, and as the lower-electrode width increased at the constant power consumption. The performance of the DBD plasma actuator can be estimated at the given discharge and geometry conditions.

OPTICAL CHARACTERIZATION OF 50 Hz ATMOSPHERIC PRESSURE SINGLE DIELECTRIC BARRIER DISCHARGE PLASMA

A low frequency (50Hz) dielectric barrier discharge (DBD) system with a single dielectric cover on copper coil anode is designed to generate and sustain the micro-discharge plasma which is very practical for material processing applications. The DBD system is powered by a high tension ac source consisting of a conventional step up transformer and variac. The dielectric barriers (quartz and glass) between the conducting electrodes appreciably influences the discharge plasma characterized by optical emission spectroscopy technique. Using intensity ratio method, the electron temperature and electron number density are determined from recorded spectra as function of ac input voltage, type and thickness of dielectric barrier and inter-electrode gap. It is observed that both the electron temperature and electron number density increase with the increase in ac input voltage and r/d ratio, while a decreasing trend is observed with increase in inter-electrode gap.