Patent ID: 9000521
Filing Date: 2015-04-07
Classification: H01L

Abstract:
1. A method of making a body-contact SOI transistor structure on a silicon-on-insulator (SOI) substrate, the SOI substrate including upper silicon on an insulator layer on bottom silicon, the method comprising: forming an opening through the upper silicon and the insulator layer, the opening exposing the bottom silicon; laterally etching the insulator layer underneath the upper silicon through the opening to create recessed regions in the opening underneath the upper silicon; filling the recessed regions with a polysilicon layer such that the polysilicon layer connects the upper silicon and the bottom silicon; filling the opening with an insulating dielectric layer; forming a gate stack over the SOI substrate, the gate stack having a first portion covering the opening and a second portion extending from the first portion and covering an area of the upper silicon across a middle portion of an active region of the body-contact SOI transistor; and forming source/drain junctions of the body-contact SOI transistor structure on opposite sides of the gate stack using self-aligned processes such that one of the source/drain junctions is on a first side of the opening while the other one of the source/drain junctions is on a second side of the opening opposite to the first side of the opening.