Some embodiments of the present disclosure relate to an integrated chip having a vertical transistor device. The integrated chip may have a semiconductor body with a trench extending along first sides of a source region, a channel region over the source region, and a drain region over the channel region. A gate electrode is arranged along a first sidewall of the trench, and a metal contact is arranged on the drain region. An isolation dielectric material is disposed within the trench. The isolation dielectric material is vertically over a top surface of the gate electrode and is laterally adjacent to the gate electrode.