Vertical gate conductor with buried contact layer for increased contact landing area

摘要

An access transistor for a semiconductor device includes a gate disposed in an upper region of a deep trench formed within a substrate of the semiconductor device. A gate contact is formed atop the gate, the gate contact having a diameter less than that of the deep trench and the gate. A conductive layer surrounds the gate contact, the conductive layer being disposed over the deep trench and over an active area of the semiconductor device surrounding the deep trench. The conductive layer provides a effective contact landing area for a diffusion region formed in the active area, wherein the effective contact landing area further includes a region between the diffusion region and the gate contact.