Patent ID: 9048339
Filing Date: 2015-06-02
Classification: H01L

Abstract:
1. A method of forming a deep trench capacitor in a semiconductor-on-insulator (SOI) substrate, wherein the deep trench capacitor is formed prior to forming the SOI substrate, the method comprising: providing a pad layer positioned above a bulk substrate; etching a deep trench into the pad layer and the bulk substrate extending from a top surface of the pad layer down to a location within the bulk substrate, the deep trench having a sidewall and a bottom; doping a portion of the bulk substrate located along the sidewall and the bottom of the deep trench to form a buried plate, the buried plate being conductive; depositing a node dielectric, an inner electrode, and a dielectric cap substantially filling the deep trench, the node dielectric being located between the buried plate and the inner electrode, the dielectric cap being located at a top of the deep trench; and removing the pad layer selective to the node dielectric and the dielectric cap such that a portion of the deep trench capacitor including an exposed portion of the node dielectric extends above a top surface of the bulk substrate followed by growing an insulator layer directly on top of the bulk substrate, and growing a SOI layer on top of the insulator layer.