Applied Materials, Inc.
METHODS AND APPARATUSES FOR FORMING INTERCONNECTION STRUCTURES

Abstract:

Methods and apparatus for lowering resistivity of a metal line, including: depositing a first metal layer atop a second metal layer to under conditions sufficient to increase a grain size of a metal of the first metal layer; etching the first metal layer to form a metal line with a first line edge roughness and to expose a portion of the second metal layer; removing impurities from the metal line by a hydrogen treatment process; and annealing the metal line at a pressure between 760 Torr and 76,000 Torr to reduce the first line edge roughness.