Patent ID: 8298934
Filing Date: 2012-10-30
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure comprising: providing a patterned material stack comprising a lower layer of polysilicon and an upper layer of polysilicon germanium on a surface of a semiconductor substrate, said patterned material stack having sidewalls that are covered by at least one spacer; removing said upper layer of polysilicon germanium from said patterned material stack; forming a first metal semiconductor alloy layer within said polysilicon layer and forming a second metal semiconductor alloy layer within said semiconductor substrate at a footprint of said at least one spacer; forming a first metallic contact comprising a metal from Group VIII or IB of the Periodic Table of Elements and at least one of W, B, P, Mo and Re on, and self-aligned to said first metal semiconductor alloy layer; and forming a second first metallic contact comprising a metal from Group VIII or IB of the Periodic Table of Elements and at least one of W, B, P, Mo and Re on, and self-aligned to said second metal semiconductor alloy layer, wherein said forming said first and second metallic contacts are performed simultaneously or in separate steps.