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
Wild card auto completion
Pharmaceutical composition for treating CAPRIN-1 expressing cancer
Semiconductor arrangement with a solder resist layer
Cosmetic or pharmaceutical peptides containing uncoded amino acids and their use in the treatment and/or care of the skin, mucous membranes, or scalp
Control apparatus and control method
Apparatus and method for storing event information for an HVAC system
Isoselective polymerization of epoxides
  Randomly Featured Patents
Polymyxin B conjugates
Synthesis and application of vapor grafted porous materials
Ribbon overbraid cable
Model based diagnosis and repair for event logs
Method, apparatus and system for sharing network resources
Dynamic adjustment of mirror service policy for logical volumes in a disk drive system based on collected statistics
Tensioned optical element and display
Conformable balloonless catheter
Agitation system for blowing wool machine
Light emitting diode bulb