Patent ID: 8232162
Filing Date: 2012-07-31
Classification: H01L

Abstract:
1. A method of forming a deep trench structure for a semiconductor device, the method comprising: forming a mask layer over a semiconductor substrate; forming an opening in the mask layer by patterning the mask layer; forming a deep trench in the semiconductor substrate using the patterned opening in the mask layer; forming a sacrificial fill material over the mask layer and into the deep trench; recessing a first portion of the sacrificial fill material from the deep trench and performing a first dopant implant to form a first doped region in the semiconductor substrate; and recessing a second portion of the sacrificial fill material from the deep trench and performing a second dopant implant to form a second doped region in the semiconductor substrate, wherein the second doped region is formed underneath the first doped region such that the second doped region and the first doped region are contiguous with each other.