Patent ID: 9276131
Filing Date: 2016-03-01
CPC Classification: H01L

Claim Text:
1. A heterojunction bipolar transistors with stress release metal electrodes comprising: a substrate; a collector layer with a front surface; at least one collector electrode having a length, a width, a bottom surface contacting said front surface of said collector layer, wherein said collector electrode has of collector stress release sections along said length of said collector electrode each said collector stress release section has a section length and forms a collector electrode cavity having a collector electrode cavity height, causing a portion of said bottom surface of said collector electrode at location of each said collector stress release section from contacting said front surface of said collector layer; a base layer with a front surface; at least one base electrode having a length, a width, and a bottoms surface contacting said front surface of said base layer, wherein said base electrode has a plurality of base stress release sections along aid length of said base electrode, each said base stress release section has a section length and forms a base electrode cavity having a base electrode cavity height, causing a portion of said bottom surface of said base electrode at location of each said base stress release section from contacting said front surface of said base layer; an emitter layer with a front surface; and at least one emitter electrode having a length, a width, and a bottom surface contacting said front surface of said emitter layer, wherein said emitter electrode has a plurality of emitter stress release sections along said length of said emitter electrode, each said emitter stress release section has a section length and forms an emitter electrode cavity having an emitter electrode cavity height, causing a portion of said bottom surface of said emitter electrode at location of each said emitter stress release section from contacting said front surface of said emitter layer.