Patent ID: 6900140

Claim:
A method for forming at least one opening in an organic-containing insulating layer, comprising: covering the organic-containing insulating layer with a bilayer comprising a resist hard mask layer and a resist layer, wherein the resist hard mask layer is formed on the organic-containing insulating layer, and wherein the resist layer is formed on the resist hard mask layer; patterning the bilayer, whereby a patterned bilayer is obtained; and plasma etching the organic-containing insulating layer in a reaction chamber containing a gaseous mixture, whereby an opening is created in the organic-containing insulating layer, wherein the gaseous mixture comprises a fluorine-containing gas and an inert gas, wherein the gaseous mixture contains essentially no oxygen-containing gas, wherein substantially no etch residue is deposited while creating the opening, and wherein the side walls of the opening are fluorinated such that anisotropy of the plasma etching is increased.