Patent ID: 6979884
Filing Date: 2005-12-27
Classification: H01L

Abstract:
1. A bipolar transistor comprising: a base region comprising an intrinsic base region and surrounding raised extrinsic base regions; a block emitter region comprising: at least a polysilicon emitter located atop and in contact with said intrinsic base region, and a vertical sidewall formed of an insulator and having a vertically-straight outer edge; a first silicide layer locate on the raised extrinsic base region, said first silicide layer having an inner vertical edge that is self-aligned to a said vertical sidewall of the block emitter region; a second suicide layer located on said polysilicon emitter and within the block emitter region, said second silicide layer having an outer edge that is vertically self-aligned to said inner vertical edge of the first silicide layer; and a self-aligned emitter contact border having an inner vertical edge that is vertically aligned to said inner vertical edge of said first silicide layer, wherein said inner vertical edge of said self-aligned emitter contact border is in contact with said vertically-straight outer edge of said vertical sidewall; and wherein a top of said self-aligned emitter contact border substantially levels with a top of said vertical sidewall.