Patent ID: 6274919
Filing Date: 2001-08-14
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate of a first conductivity type;an arrangement of active regions on said semiconductor substrate separated by non-active regions, each active region including at least one functional semiconductor element;a field-shield isolation structure fabricated in said non-active regions, said field-shield isolation structure comprising,a field-shield insulator film on side-wall surfaces and a bottom surface of a trench cavity, said side-wall surfaces extending from an opening in an upper surface of the semiconductor substrate to the bottom surface of the trench cavity to define the trench as being completely within the semiconductor substrate, said field-shield insulator film providing electrical isolation between said active regions, anda field-shield electrode in said trench cavity in contact with said field-shield insulator film, said field-shield electrode having a top surface level with said upper surface of the semiconductor substrate; andwherein a depth-dimension of the trench cavity is deeper than a diffusion distance of a dopant species associated with the functional semiconductor elements in each of said active regions.