Spatial stabilization of Townsend discharge in a modified ionization cell with symmetrical short gaps between semiconductor plate and electrodes

A Townsend-type discharge generated in a modified ionization cell with symm etrical short gaps between a high-resistivity semiconductor plate and two p lanar electrodes is studied. The spatial stabilization of the gas discharge cell with a planar GaAs semiconductor plate is studied over a wide range o f gas pressure values 101-342 Torr. The characteristics of the system are o btained both without and with illumination of the semiconductor plate with light of a particular wavelength range to control the photoconductivity of the material. The semiconductor material is found to stabilize the discharg e. It is shown that generation of carriers by a gas discharge establishes a positive feedback. A qualitative discussion of this effect is given, which includes avalanche formation in a system having high-resistivity semicondu ctor for the Townsend discharge region. Recording of the current-voltage ch aracteristic between parallel-plane electrodes is realized.