Integrated micro-plasmas in silicon operating in helium

TL;DR

This paper reports the development and analysis of silicon-based microplasma arrays operating in helium, exploring ignition conditions, structural effects, and thermal impacts in microfabricated devices.

Contribution

It introduces silicon microre-actors with cathode boundary layer microdevices and investigates their ignition behavior under various conditions.

Findings

100 microdischarges of 50 μm diameter ignited at 1000 torr

Reversing polarization increases ignition voltage

Thermal zones observed around anode holes after operation

Abstract

Microplasma arrays operating in helium in a DC regime have been produced in silicon microre-actors. Cathode boundary layer (CBL) type microdevices were elaborated using clean room facilities and semiconductor processing techniques. Ignition of the micro-discharge arrays having either 50 or 100 m diameter cavities was studied. Two different structures (isotropically etched or anisotropically etched cavity) and various conditions (the two different voltage polarities, pressures etc.) were investigated. 100 microdis-charges of 50 m diameter could be ignited in parallel at 1000 torr. At high current, some parasitic and transient sparks appeared at the edge of the sample. When the polarization was reversed (cathode side corresponding the opened electrode), more current was needed to light all the microdischarges. A thermally affected zone around the hole on the anode side was obtained after operation.