Patent ID: 9412640
Filing Date: 2016-08-09
CPC Classification: H01L

Claim Text:
1. A method of forming a contact on a semiconductor device, the method comprising: forming a mask on the semiconductor device, the mask exposing at least one contact region including a polysilicon node disposed in a trench of a substrate of the semiconductor device; performing a first substrate contact etch on the semiconductor device, the first substrate contact etch recessing the polysilicon node within the trench; removing a set of node films disposed about the polysilicon node and on the sides of the trench, wherein the set of node films include at least two films that extend below the polysilicon node, the polysilicon node being disposed entirely within the substrate and the set of node films; and forming a contact region within the trench to the substrate and completely covering a top surface of the polysilicon node.