Silicide contact plug formation technique

摘要

An integrated circuit fabrication process for improving step coverage of the metal lines and of metal layer interconnections is disclosed. A conductive polysilicon, polycide, or polycide-on-polysilicon plug is formed in contact apertures by successive silicidation sequences of silicon/refractory metal deposition and heat treatment. A preceding silicide may also be removed prior to a succeeding silicidation to reduce silicon lining.