Patent ID: 9054045
Filing Date: 2015-06-09
Classification: H01L

Abstract:
1. A method for anisotropic etching of a pattern in at least one layer to be etched through a hard mask comprising carbon in an inductively-coupled plasma etching reactor, the method comprising: etching an intermediate layer to obtain an intermediate hard mask situated on a hard mask layer comprising carbon-doped boron, then etching the hard mask layer comprising carbon-doped boron through the intermediate hard mask to form a hard mask comprising carbon-doped boron, and then anisotropically etching the at least one layer to be etched, wherein: the etching of the hard mask layer comprising carbon-doped boron is performed in a plasma comprising chlorine (Cl the etching of the intermediate layer and the etching of the hard mask layer comprising carbon-doped boron are both performed in the inductively-coupled plasma etching reactor.