Patent ID: 6403471
Filing Date: 2002-06-11
Classification: H01L

Abstract:
A dual damascene manufacturing method, which is applicable on a dual damascene structures, wherein said dual damascene structure is formed by sequentially stacking a first dielectric layer using a spin-on glass method, an etching stop layer and a thermally stable second dielectric layer, a via is formed in said first dielectric layer, a trench line is formed in said second dielectric layer such that said via is located under said trench line, and said etching stop layer at a bottom of said trench line is removed, said dual damascene manufacturing method comprising the steps of:conducting a thermal treatment to smooth out said first dielectric layer at said bottom of said trench line and in said via to form a larger and smoother opening at a top part of said via; forming a barrier layer to cover said second dielectric layer, said trench line and said via; forming a metal layer to cover said barrier layer and to fill said trench line and said via; and removing said barrier layer and said metal layer on a surface of said second dielectric layer.