Patent ID: 7713814
Filing Date: 2010-05-11
Classification: H01L

Abstract:
1. A method of forming a deer trench capacitor comprising: providing a hybrid orientations substrate comprising a handle substrate having a first crystallographic orientation, a buried insulator layer vertically abutting said handle substrate, a to semiconductor portion having a second crystallographic orientation and vertically abutting said insulator layer, a dielectric spacer laterally abutting said buried insulator layer and said to semiconductor portion, and an epitaxial semiconductor portion having the first crystallographic orientation, epitaxially aligned to and vertically abutting said handle substrate, and laterally abutting said dielectric spacer; forming a substantially straight trench in said epitaxial semiconductor portion and said handle substrate wherein a part of said epitaxial semiconductor remains overlying said dielectric spacer; laterally expanding said substantially straight trench by removal of material in said epitaxial semiconductor portion and said handles substrate to form a bottled shaped trench, wherein a lateral extent of said bottled shaped trench is limited by said dielectric spacer above an interface between said handle substrate and said buried insulator layer, and wherein of sidewall of said bottles shaped trench laterally extends beyond an outer sidewall of said dielectric spacer below said interface; and forming a buried plate by introducing electrical dopants into a portion of said handle substrate and said epitaxial semiconductor portion located directly on sidewalls of said bottle shaped trench, wherein said dielectric spacer blocks diffusion of said electrical dopants into said top semiconductor portion.