Patent ID: 7420227
Filing Date: 2008-09-02
Classification: H01L

Abstract:
1. A Cu-metalized compound semiconductor device having an HBT (Heterojunction Bipolar Transistor) structure, comprising: a substrate; an auxiliary base layer; a first n-type ohmic contact layer; a p-type ohmic contact layer; a second n-type ohmic contact layer; a metal interconnect; a collector layer; a dielectric layer; a base layer; an emitter layer; and a dotted layer, characterized in that (a) said substrate is made of GaAs; (b) said first n-type ohmic contact layer and said second n-type ohmic contact layer are made of Pd/Ge/WN (c) said p-type ohmic contact layer is made of Pt/Ti/Pt/Cu; and (d) said metal interconnect is made of Ti/Pt/Cu and is comprised of a diffusion barrier and a Cu.