Patent ID: 9614078
Date: 2017-04-04
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a semiconductor substrate; a gate structure disposed on the semiconductor substrate; a source region and a drain region disposed on opposite sides of the gate structure on the semiconductor substrate; a lightly doped drain region adjacent to a side of the drain region adjacent to the gate structure; a lightly doped source region adjacent to a side of the source region adjacent to the gate structure; an oxide region disposed in the lightly doped drain region; a trench extending from a surface of the semiconductor substrate into the drain region; a source electrode disposed on the source region; and a drain electrode having a first portion disposed on the drain region and a second portion disposed in the trench, wherein a bottom surface of the second portion of the drain electrode is lower than a bottom surface of the lightly doped drain region.