Patent ID: 6376369
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A recess filling method comprising:providing a semiconductor substrate having a recess therein, said recess having an opening thereto; forming a barrier layer within said recess; forming a first metal layer upon said barrier layer, said first metal layer being formed of a metal or metal alloy that is selected to have a first melting point that is sufficiently low to not damage the barrier layer; filling up the recess with the first metal layer by exposing the semiconductor substrate to a selected pressure and a selected temperature until the first metal layer closes the opening to the recess and the recess has a void therein; forming a second metal layer upon said first metal layer, said second metal layer having a second melting point that is at least 10Â° C. greater than the first melting point of said first metal layer, said second metal layer being formed of a metal or metal alloy that is selected to have desired stress migration and electromigration properties; and heating and pressuring the first and second metal layers until the first and second metal layers fill the void in the recess.