Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Heterojunction bipolar transistor and method of producing the same










Image Number 7 for United States Patent #6924201.

A heterojunction bipolar transistor of the present invention is produced from a wafer including a substrate and a collector layer of a first conductivity type, a base layer of a second conductivity type and an emitter layer of the first conductivity type sequentially laminated on the substrate in this order. First, the wafer is etched up to a preselected depth of the collector layer via a first photoresist, which is formed at a preselected position on the emitter layer, serving as a mask. Subsequently, the collector layer etched with at least the sidewalls of the base layer and collector layer, which are exposed by the first etching step, and a second photoresist covering part of the surface of the collector layer contiguous with the sidewalls serving as a mask.








 
 
  Recently Added Patents
Method for cutting the lower and at least one upper thread and a method for lead-in stitching as well as a device for implementing the method
Reconnecting dropped calls using an internet protocol multimedia subsystem
System and method for monitoring outbreak of contagious diseases
Dehydrator
Thermoset polyimides for microelectronic applications
Foldable tonneau cover and hinge therefor
Personal stretching device
  Randomly Featured Patents
Electrical power generation
Method for verification of data and metadata in a data repository
Remote simulation by remote control from a computer desk
Boiling detecting devices for a stove
Multi-mode memory addressing using variable-length
Back frame of chair
Tracing technique and recording media of object motion
Method and apparatus for implementing a computer network/internet telephone system
Production of a radiation detector
Remote control system and home gateway apparatus