Patent ID: 6064118
Filing Date: 2000-05-16
Classification: H01L

Abstract:
A semiconductor device comprising a semiconductor substrate, a first dielectric film overlying said semiconductor substrate, first metal interconnects having a top portion and a bottom portion, wherein said top portion is disposed on a top surface of said first dielectric film and said bottom portion extends through said first dielectric film to contact said semiconductor substrate, a first air gap occupying substantially all of a space between said first dielectric film and a second dielectric film formed on said top portion of said first metal interconnects, except in a space occupied by said first metal interconnects, second metal interconnects having a top portion and a bottom portion, wherein said top portion is disposed on a top surface of said second dielectric film and said bottom portion of said second metal interconnects extends through said second dielectric film to contact said top portion of said first metal interconnects, said first air gap communicating with a second air gap, said second air gap occupying substantially all of a space between said second dielectric film and a third dielectric film formed on said top portion of said second metal interconnects, except in a space occupied by said second metal interconnects, between said second dielectric film and a third dielectric film formed on said top portion of said second metal interconnects, said semiconductor device further comprising a side-wall film covering side surfaces of each of said top portion of at least one of said first metal interconnects and said second metal interconnects.