Patent ID: 8008142
Filing Date: 2011-08-30
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure comprising: forming an overlying structure on a first-conductivity-type-doped semiconductor material portion; forming a second-conductivity-type-doped semiconductor region self-aligned to a sidewall of said overlying structure, wherein said second conductivity type is the opposite of the first conductivity type; forming a first-conductivity-type-doped semiconductor region contacting sidewalls of a shallow trench isolation (STI) structure and not contacting said second-conductivity-type-doped semiconductor region by implanting dopants of said first conductivity type into a portion of said first-conductivity-type-doped semiconductor material portion after formation of said overlying structure; and converting a portion of said second-conductivity-type-doped semiconductor region to a first metal semiconductor alloy portion and an upper portion of said first-conductivity-type-doped semiconductor region into a second metal semiconductor alloy portion, wherein a bottom surface of said first metal semiconductor alloy portion contacts a horizontal surface of said first-conductivity-type-doped semiconductor material portion to form a Schottky barrier, wherein a horizontal top surface of a remaining lower portion of said first-conductivity-type-doped semiconductor region contacts a bottommost surface of said second metal semiconductor alloy portion after formation of said second metal semiconductor alloy portion.