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
Toy track intersection component
Method for driving electrophoretic display device, electrophoretic display device, and electronic device
Method and system for reduction of decoding complexity in a communication system
Codeword-enhanced peer-to-peer authentication
Storage basket with lid
Apparatus and methods for providing efficient space-time structures for preambles, pilots and data for multi-input, multi-output communications systems
Processor micro-architecture for compute, save or restore multiple registers, devices, systems, methods and processes of manufacture
  Randomly Featured Patents
Cable having ESD dissipative adhesive electrically connecting leads thereof
Continuous catheter flushing apparatus
Analysis of multiple assets in view of uncertainties
Efficient fuzzy matching of a test item to items in a database
Carrier plates and a method for their production
Estimating a point spread function of an image capture device
Lifting harness
Service oriented architecture automation by cab or taxi design pattern and method
Transmission housing structure for four wheel drive system
Telephone set circuit including an overvoltage protection