公开(公告)号：US20180151732A1

公开(公告)日：2018-05-31

申请号：US15575008

申请日：2015-06-19

Applicant: INTEL CORPORATION

Inventor： RISHABH MEHANDRU ,  ANAND S. MURTHY ,  TAHIR GHANI ,  GLENN A. GLASS ,  KARTHIK JAMBUNATHAN ,  SEAN T. MA ,  CORY E. WEBER

IPC: H01L29/78 ,  H01L29/167 ,  H01L29/08 ,  H01L29/165 ,  H01L29/66 ,  H01L21/306 ,  H01L21/02 ,  H01L29/06 ,  H01L21/762

CPC classification number: H01L29/7848 ,  H01L21/0245 ,  H01L21/02532 ,  H01L21/02579 ,  H01L21/30604 ,  H01L21/76224 ,  H01L21/823814 ,  H01L21/823821 ,  H01L21/823878 ,  H01L27/0886 ,  H01L27/0924 ,  H01L29/0649 ,  H01L29/0673 ,  H01L29/0847 ,  H01L29/165 ,  H01L29/167 ,  H01L29/42392 ,  H01L29/66439 ,  H01L29/66545 ,  H01L29/66636 ,  H01L29/66795 ,  H01L29/775 ,  H01L29/78 ,  H01L29/785 ,  H01L29/7851 ,  H01L29/78618 ,  H01L29/78696

Abstract: Techniques are disclosed for resistance reduction in p-MOS transistors having epitaxially grown boron-doped silicon germanium (SiGe:B) S/D regions. The techniques can include growing one or more interface layers between a silicon (Si) channel region of the transistor and the SiGe:B replacement S/D regions. The one or more interface layers may include: a single layer of boron-doped Si (Si:B); a single layer of SiGe:B, where the Ge content in the interface layer is less than that in the resulting SiGe:B S/D regions; a graded layer of SiGe:B, where the Ge content in the alloy starts at a low percentage (or 0%) and is increased to a higher percentage; or multiple stepped layers of SiGe:B, where the Ge content in the alloy starts at a low percentage (or 0%) and is increased to a higher percentage at each step. Inclusion of the interface layer(s) reduces resistance for on-state current flow.