Patent ID: 8796764
Filing Date: 2014-08-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a trench; a buried insulated source electrode arranged in a bottom portion of the trench; first and second gate electrodes arranged in an upper portion of the trench and spaced apart from one another; and a surface gate contact extending into the upper portion of the trench and being in physical and electrical contact with the first and second gate electrodes, the surface gate contact providing a through contact portion which extends through an intermediate oxide layer into the trench, wherein the trench further includes a spacer extending from the buried insulated source electrode to the surface gate contact, the spacer comprising sidewalls perpendicular to the semiconductor substrate, the sidewalls extending between the buried insulated source electrode and the first and second gate electrodes, wherein the spacer overlaps lower regions of the first and second gate electrodes and fills all the space directly between the lower regions of the first and second gate electrodes, wherein the buried insulated source electrode is arranged entirely below the first and second gate electrodes, and wherein the spacer consists of Si