Patent ID: 9123652
Filing Date: 2015-09-01
Classification: H01L,Y02E

Abstract:
1. A method for producing patterns comprising inclined flanks from a face of a substrate, comprising formation of a protective mask covering at least two masked areas of the face of the substrate and defining at least one intermediate space; etching with a plasma forming, on at least one intermediate space, at least one inclined flank from each masked area, wherein the etching comprising the formation of a continuous passivation layer on the inclined flanks producing autolimitation of the etching when the inclined flanks join each other, and wherein the etching is carried out in a chamber and comprises the introduction into the chamber of a gas additional to the plasma, said additional gas comprising molecules of a chemical species participating in the formation of the passivation layer, the quantity of gas in the chamber being controlled so that the chamber contains, throughout the etching, a quantity of molecules of the species sufficient to form the passivation layer continuously, wherein the passivation layer comprises a chemical species of the substrate, and the etching is configured so as to generate molecules of the chemical species of the additional gas during the etching of the substrate.