Patent ID: 7244975

Claim:
A high-voltage device structure, the high-voltage device structure being disposed in an active region of a semiconductor substrate divided into the active region and an isolation region, the high-voltage device structure comprising: a first ion implantation region of a first conductive type and a second ion implantation region of a first conductive type disposed in the active region; a source diffusion region and a drain diffusion region disposed in the first ion implantation region and the second ion implantation region respectively; a channel diffusion region disposed between the first ion implantation region and the second ion implantation region and connecting the two ion implantation regions; a gate disposed between the source diffusion region and the drain diffusion region and above the channel diffusion region, the gate being longer than the source diffusion region and the drain diffusion region forming two spare regions on both sides of the gate; an isolation ion implantation region of a second conductive type disposed in the isolation region; and an extended ion implantation region of the second conductive type disposed under the spare region of the gate and covering portions of the channel diffusion region.