Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Process for producing a high performance bipolar structure










Image Number 6 for United States Patent #6004855.

A process for producing a small shallow-depth high-performance bipolar structure having low parasitic capacitance is disclosed wherein an active base region of a P-type material is first defined in a substrate, a portion of which is of N-type material in a device formation area surrounded by an isolating oxide regions, such as trenches or the like. An N-doped polysilicon layer is then defined over the active base region and over field oxide regions located atop the isolating trenches. This N-poly region, when treated, will provide an interdigitated collector with self aligning emitter region aligned over the active base region. After appropriate spaced isolation layers are placed, a P-poly layer is laid down and heat treated to cause the P-type doping material to diffuse into the substrate contact to the active base region. A thin buried collector layer, approximately 1.5- to 2-micron thick, can be used as a result of the combination of an interdigitated collector design and a thin epitaxial region in which the active base is located; this combination contributing to a low effective collector resistance that compensates for the increased resistance associated with a thinner buried collector layer. The process provides for collector contacts in close proximity to the active device region permitting fabrication of a small device with very low parasitic capacitance.








 
 
  Recently Added Patents
Switchable memory diodes based on ferroelectric/conjugated polymer heterostructures and/or their composites
Seat post having a non-uniform cross-section
Methods and systems for distributing broadcast messages on various networks
Program recording medium, image processing apparatus, imaging apparatus, and image processing method
Fluid intake and content management system
Organic electroluminescence device
Method of estimating remaining constant current/constant voltage charging time
  Randomly Featured Patents
Rhythm generator
Device for video transmission between a camera and a control room
Apparatus and method for treating soft tissue injuries
Process for removal and recovery of mercury from liquids
Semiconductor laser amplifier
Naphthenic acid esters as dispensing agents for pigment additives and products incorporating same
Process for the production of 2-amino-5-mercapto-1,3,4-thiadiazole
Scratch testing device
Systems and methods for enhancing the provisioning and functionality of wireless instruments
Skip-scorer, skip perforator for use with printing press systems