Patent ID: 6828603
Filing Date: 2004-12-07
Classification: H01L

Abstract:
A hetero-bipolar transistor having a collector layer, a base layer made of a first III-V semiconductor material with a first band gap energy and an emitter layer made of a second III-V semiconductor material with a second band gap energy greater than the first band gap energy, the hetero-bipolar transistor comprising:a semiconductor substrate having a primary surface; a sub-collector layer having a first portion and a plurality of second portions, the first portion being substantially rectangular with one side extending along the [011] direction, the plurality of second portions being in contact with the one side of the first portion; a collector electrode on the sub-collector layer; and a wiring metal electrically contacting to the collector electrode, the wiring metal traversing at least one of four sides of the first portion and at least one of the plurality of the second portions.