Patent ID: 8999804
Filing Date: 2015-04-07
Classification: G06F,H01L

Abstract:
1. A method of fabricating a bipolar junction transistor, the method comprising: forming a first layer comprised of a first semiconductor material and disposed on a substrate; forming a first mask layer on the first layer; patterning the first mask layer to form a plurality of openings to the first layer; after the first mask layer is formed and patterned, etching through the first layer at the openings in the mask layer to define a first trench, a second trench separated from the first trench by a first section of the first layer defining a first terminal of the bipolar junction transistor, and a third trench separated from the second trench by a second section of the first layer defining a first isolation pedestal; and forming a first trench isolation region at a first location in the substrate determined at least in part using the first isolation pedestal as a first positional reference.