Patent ID: 6188123
Filing Date: 2001-02-13
Classification: H01L

Abstract:
A semiconductor element having a vertical discrete bipolar transistor formed in a first semiconductor layer formed on a second semiconductor layer formed on a semiconductor substrate, comprising:a base region formed in a part of said first semiconductor layer to be exposed;an emitter region formed in a part of said base region to be exposed at a surface of said first semiconductor layer;a collector region provided in said first semiconductor layer to border on said base region, at least a part of said collector region being exposed at a surface of said first semiconductor layer;a base electrode formed on an exposed surface of said base region and being electrically connected to said base region;a collector electrode formed on an exposed surface of said collector region and being electrically connected to said collector region;an emitter electrode formed on an exposed surface of said emitter region and being electrically connected to said emitter region, said emitter electrode having a wiring layer;an emitter conducting portion formed of a part of said first and second semiconductor layers and substantially the whole semiconductor substrate, for electrically connecting said emitter electrode to said semiconductor substrate, said emitter conducting portion being electrically isolated from said base region and said collector region and an area of said emitter conducting portion being greater than that of said collector region in a top plan view; andan enlarged emitter electrode formed with a same layer as said wiring layer of said emitter electrode, said enlarged emitter electrode directly connecting said wiring layer of said emitter electrode to said emitter conducting portion.