Patent ID: 7800184
Filing Date: 2010-09-21
Classification: H01L

Abstract:
1. An integrated circuit structure comprising: a substrate; a semiconductor layer above said substrate and having a first top surface; a first device comprising a first diffusion region within said semiconductor layer at said first top surface; a second device comprising a second diffusion region within said semiconductor layer at said first top surface; an isolation structure between said first diffusion region and said second diffusion region, said isolation structure having a second top surface approximately level with said first top surface; and an interconnect structure comprising a silicon germanium film, said silicon germanium film being rectangular in shape and having a center portion on said second top surface only of said isolation structure and end portions extending laterally beyond said second top surface onto said first top surface such that said end portions contact said first diffusion region and said second diffusion region, said interconnect structure electrically connecting said first diffusion region to said second diffusion region, wherein said end portions of said silicon germanium film above said first diffusion region and said second diffusion region comprise single crystalline silicon germanium, wherein said center portion of said silicon germanium film above said isolation structure comprises one of amorphous silicon germanium and polycrystalline silicon germanium, wherein boundaries between said end portions and said center portion project from upper corners of said isolation structure at a predetermined angle, wherein said silicon germanium film further has a lower portion in contact with said first diffusion region, said isolation structure and said second diffusion region, and a middle portion above said lower portion and an upper portion above said middle portion, and wherein said silicon germanium film further comprises germanium in different predetermined concentrations in at least two of said lower portion, said middle portion and said upper portion.