Patent ID: 9087923
Filing Date: 2015-07-21
Classification: H01L

Abstract:
1. A monolithic compound semiconductor structure integrating a heterojunction bipolar transistor (HBT), a field effect transistor (FET), and a thyristor structure, comprising: a substrate; an FET structure formed on said substrate, which comprises a channel layer and an n-type doped layer formed directly on said channel layer; an n-type etching-stop layer; a p-type insertion layer, formed directly on said n-type etching-stop layer; and an HBT structure formed directly on said p-type insertion, which comprises a sub-collector layer made of an n-type doped layer, a collector layer made of an n-type doped layer and formed directly on said sub-collector layer, a base layer made of an p-type doped layer and formed directly on said collector layer, and an emitter layer made of an n-type doped layer and formed directly on said base layer, wherein said p-type insertion layer comprises multiple p-type doped layers; a doping concentration in neighboring p-type doped layers of said p-type insertion layer is different to each other; the doping concentration of each p-type doped layer of said p-type insertion layer is ranging from 1×10 wherein said FET structure, said n-type etching-stop layer, said p-type insertion layer and said sub-collector layer, said collector layer, and said base layer of said HBT structure form the thyristor structure.