Patent ID: 7718481
Filing Date: 2010-05-18
Classification: H01L

Abstract:
1. A method of forming a structure, comprising: providing a substrate including a first epitaxial layer; forming a first subcollector in the first epitaxial layer; forming a second epitaxial layer over the first epitaxial layer; forming, over the first subcollector, stacked reachthroughs in the first epitaxial layer, wherein the second epitaxial layer is linked to the first subcollector; and after a portion of each stacked reachthrough is formed, forming a second subcollector in the second epitaxial layer above the first subcollector, the second subcollector being arranged between and in contact with the stacked reachthroughs, wherein portions of the stacked reachthroughs act as a border for an implanted N-well region arranged above the second subcollector, and wherein the method prevents CMOS latch-up.