Bell Telephone Laboratories

William E Willenbrock, Jr

Hyman J Levinstein

Ajit S Manocha

Eliezer Kinsbron

Stanley H Kravitz

The manufacture of VLSI devices is facilitated by a method for chlorine reactive sputter etching of silicon materials in a plasma reactor that has been passivated by a previous etching operation involving a fluorine-containing gas. The passivated reactor is reactivated for chlorine reactive sputter etching by the generation of a boron trichloride plasma in the reactor. In the preferred embodiment, a mixture of boron trichloride and chlorine is used to initiate the etching of the silicon material before pure chlorine is used to complete the etch. The invention permits silicon materials to be etched in a reactor in which chlorine and fluorine-containing gases are used sequentially.

Plasma pretreatment with BCl.sub.3 to remove passivation formed by

In the patterning of an organic layer on a VLSI wafer by means of reactive oxygen (or other) ion anisotropic etching, build-ups of oxides (or other compounds) on the sidewalls of apertures formed in the organic layer are removed prior to etching the material, typically aluminum, of the VLSI wafer located at the bottom of these apertures, using the patterned organic layer as an etch mask.

Growing community of inventors

Manchester, NJ, United States of America

William E Willenbrock, Jr