Hydrogen discharges operating at atmospheric pressure in a semiconductor gas discharge system

Abstract

Analyses of physical processes which initiate electrical breakdown and spatial stabilization of current and control it with a photosensitive cathode in a semiconductor gas discharge system (SGDS) are carried out in a wide pressure range up to atmospheric pressure p, interelectrode distance d and diameter D of the electrode areas of the semiconductor cathode. The study compares the breakdown and stability curves of the gas discharge in the planar SGDS where the discharge gap is filled with hydrogen and air in two cases. The impact of the ionizing component of the discharge plasma on the control of the stable operation of the planar SGDS is also investigated at atmospheric pressure. The loss of stability is primarily due to modification of the semiconductor-cathode properties on the interaction with low-energy hydrogen ions and the formation of a space charge of positive ions in the discharge gap which changes the discharge from Townsend to glow type. The experimental results show that the discharge current in H 2 is more stable than in air. The breakdown voltages are measured for H 2 and air with parallel-plane electrodes, for pressures between 28 and 760 Torr. The effective secondary electron emission (SEE) coefficient is then determined from the breakdown voltage results and compared with the experimental results. The influence of the SEE coefficient is stated in terms of the differences between the experimental breakdown law.

Electrical Properties of Microdischarge in Porous Zeolites

“…The main approach for generating a discharge at AP is based on the Paschen law. This indicates the possibility of having non‐equilibrium plasma at AP for the micrometer range d …”

“…The resistivity could be neglected when compared with the sheet resistivity of the zeolite layer, which was 1.5 × 10 10 Ω cm. An external electric circuit, consisting of a DC high voltage supply, U 0 , and a series resistor, R 1 , which was measured the current into the circuit, were connected to the SnO 2 and the Cu electrode (see Figure ) . The chamber was installed into discharge reactor equipped with windows, thus the plasma emission, electrical leads, and an evacuation outlet could be observed.…”

New Approach for Charge Transport Mechanisms in the Atmospheric Pressure Cold Plasma Device with Porous Zeolite

“…The glass disk coated with semi‐transparent conductive SnO 2 layer, which is an anode, located opposite of the cathode. An external electric circuit, consisting of a U 0 dc high voltage supply, and a R 1 series resistor, which measured the current into the circuit were connected to the SnO 2 and the Cu electrode . The chamber was installed into discharge reactor equipped with windows, thus the plasma emission, electrical leads, and an evacuation outlet could be observed.…”

“…An external electric circuit, consisting of a U 0 dc high voltage supply, and a R 1 series resistor, which measured the current into the circuit were connected to the SnO 2 and the Cu electrode. [24] The chamber was installed into discharge reactor equipped with windows, thus the plasma emission, electrical leads, and an evacuation outlet could be observed. A pumping system with a digital manometer provides monitoring the pressure in the chamber.…”

DC Townsend Discharge in Nitrogen: Temperature‐Dependent Phenomena

“…Discharge instabilities, which may lead to filamentation of current, in the SGD device are suppressed by the local negative feedback due to voltage drop on the high resistivity electrode [7,8]. We refer to such a structure as the semiconductor-gasdischarge device (SGD).…”