摘要:
A deep trench type DRAM cell with shallow trench isolation has a buried polysilicon strap that is defined without the use of a separate mask by depositing the strap material over at least the deep trench before shallow trench definition and using the shallow trench isolation mask to overlap partially the deep trench, thereby defining the strap during the process of cutting the shallow trench.
摘要:
A sub-surface interconnection structure for coupling an n-type diffusion (62) to a p-type diffusion (54). The structure is a conductor-filled trench (100) disposed between the diffusion regions. The trench has a thin dielectric layer (110) on its sidewalls and bottom. The conductor (120) within the trench contacts the diffusion regions. Parasitic device formation between the diffusion regions is suppressed because the trench provides a parasitic gate that is shorted to the parasitic source regions (i.e., the coupled diffusion regions). Moreover, the trench provides an enlarged contact to the coupled diffusion regions for the subsequently-applied metal layer.
摘要:
0 A method for providing high density dynamic memory cells which provides self-alignment of both V-MOSFET device elements and their interconnections through the use of a device-defining masking layer (16) having a plurality of parallel thick (16a) and thin regions (16b). Perpendicular strip-like regions (16c) of masking layer (16) are removed to expose square apertures on the surface of substrate (10, 14) in which recesses (18) are formed by an anisotropic etchant. V-MOSFET devices having self- aligned gate electrodes are formed in the recesses (18) and device interconnecting lines are formed under the remaining portions of the thin regions (16b). A combination of anisotropic etching and directionally dependent etching, such as reaction ion etching, may be used to extend the depth of the recesses.