Patent ID: 6743291
Filing Date: 2004-06-01
Classification: C30B

Abstract:
A method of forming a super-steep retrograde (SSR) well region in a silicon shape, via use of two selective epitaxial growth (SEG), procedures, comprising the steps of:forming insulator shapes on a semiconductor substrate with a space located between said insulator shapes exposing a portion of said semiconductor substrate; performing a first SEG procedure to selectively form a bottom silicon shape on said portion of said semiconductor substrate exposed in a bottom portion of said space; performing an ion implantation procedure to place a body of ions in a said bottom silicon shape; performing a second SEG procedure to selectively form a top silicon shape on said bottom portion of said silicon shape, resulting in a composite silicon shape comprised of said top silicon shape overlying said bottom silicon shape; and performing an anneal procedure to activate, and to distribute said bottom of ions, and to form said SSR well region in said composite silicon shape.