Patent ID: 9553177
Date: 2017-01-24
CPC Classifications: H01L,H03K

Claim:
1. A method, comprising: applying a first base signal to turn on a transistor with a collector on a semiconductor substrate, an emitter with a polysilicon material and a single crystal material, vertical base contacts with an intrinsic base region formed in the single crystal material, an extrinsic base region, and a number of base links, wherein the entire intrinsic base region is formed above the extrinsic base region, wherein the number of base links each have an upper surface that contacts a bottom surface of the intrinsic base region and vertically link the extrinsic base region to the intrinsic base region, and wherein the number of base links are at least partially in an area below the emitter and at least partially in an area between a first sidewall of the emitter and a second sidewall of the emitter; and applying a second base signal to turn off the transistor.