Patent ID: 8536646

Claim:
A trench type power transistor device, comprising: a semiconductor substrate of a first conductivity type, having an active region and a peripheral region, and the semiconductor substrate having at least one first trench; at least one transistor cell, disposed in the active region, and the transistor cell comprising: a first gate conductive layer, disposed in the first trench; a gate insulating layer, disposed in the first trench and between the first gate conductive layer and the semiconductor substrate; a doped body region of a second conductivity type, disposed in the semiconductor substrate at a side of the first trench; and a doped source region of the first conductivity type, disposed in the doped body region; a gate metal layer, disposed on the semiconductor substrate in the peripheral region; a source metal layer, disposed on the semiconductor substrate in the active region; and a second gate conductive layer, disposed between the first gate conductive layer and the source metal layer, and the second gate conductive layer partially overlapping the first gate conductive layer and the source metal layer in a direction perpendicular to the semiconductor substrate, wherein the second gate conductive layer electrically connects the first gate conductive layer to the gate metal layer, and the second gate conductive layer is electrically insulated from the source metal layer and the semiconductor substrate.