Patent ID: 6812107
Filing Date: 2004-11-02
Classification: H01L

Abstract:
A method for fabricating a bipolar transistor, said method comprising steps of:fabricating a first inner spacer and a second inner spacer on a top surface of a base; implanting a first dopant into said base to form a first implanted dopant region and a second implanted dopant region after said step of fabricating said first and second inner spacers; forming a first outer spacer adjacent to and on the outside of said first inner spacer and over said first implanted dopant region and a second outer spacer adjacent to and on the outside of said second inner spacer and over said second implanted dopant region, wherein said first and second outer spacers are formed after said step of fabricating said first and second inner spacers and after said step of implanting said first dopant; implanting a second dopant into said base after said step of forming said first and second outer spacers; depositing an emitter between said first inner spacer and said second inner spacer on said top surface of said base.