71 results about "Tetrafluoromethane" patented technology

Methods of etching silicon nitride material, and more particularly, etching nitride selective to silicon dioxide or silicide, are disclosed. The methods include exposing a substrate having silicon nitride thereon to a plasma including at least one fluorohydrocarbon and a non-carbon containing fluorine source such as sulfur hexafluoride (SF6). The plasma may also include oxygen (O2) and the fluorohydrocarbons may include at least one of: trifluoromethane (CHF3), difluoromethane (CH2F2), and methyl fluoride (CH3F). In an alternative embodiment, the plasma includes one of hydrogen (H2) and nitrogen trifluoride (NF3) and one of tetrafluoromethane (CF4) and octafluorocyclobutane (C4F8). The methods are preferably carried out using a low bias voltage, e.g. <100 V.

The invention provides a plasma processing method and a cleaning method of a plasma processing apparatus, capable of preventing particles generated from a silicon-containing member for forming a plasma generating chamber from adhering to a processing target substrate. The plasma processing apparatus in which a cleaning method is performed includes a plasma generating chamber, having a silicon-containing member, for generating therein plasma by exciting a processing gas; a plasma processing chamber communicating with the plasma generating chamber via a partition member; and a high frequency antenna, having a planar shape, provided at an outside of a dielectric window of the plasma generating chamber. The cleaning method includes exciting a hydrogen-containing processing gas into plasma in the plasma generating chamber, introducing hydrogen radicals in the plasma into the plasma processing chamber through the partition member, performing a plasma process on a processing target substrate by allowing the hydrogen radicals to act on the processing target substrate, unloading the processing target substrate, and removing silicon-based deposits generated in the plasma generating chamber by introducing a tetrafluoride (tetrafluoromethane) gas into the plasma generating chamber.

The present invention relates to a medium- or high-voltage electrical apparatus which includes a sealed enclosure containing electrical components and a gas mixture providing electrical insulation and / or the extinction of electric arcs that may occur inside said enclosure, the gas mixture including heptafluoroisobutyronitrile and tetrafluoromethane. The sealed enclosure of the electrical apparatus according to the invention can contain electrical components covered with a solid dielectric layer having a variable thickness.