Patent ID: 11923435
Assignee: WINBOND ELECTRONICS CORP.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A high voltage semiconductor device, comprising:
a semiconductor substrate;
a first drift region disposed in the semiconductor substrate;
a gate structure disposed on the semiconductor substrate;
a first sub gate structure disposed on the first drift region and separated from the gate structure;
a first spacer structure disposed on a sidewall of the gate structure;
a second spacer structure disposed on a sidewall of the first sub gate structure;
a first insulation structure disposed on the first drift region, wherein at least a part of the first insulation structure is located between the first spacer structure and the second spacer structure, a first portion of the first drift region is located between the first spacer structure and the second spacer structure, and the first insulation structure is directly connected with the first portion of the first drift region;
a first gate oxide layer, wherein a part of the first gate oxide layer is sandwiched between the first spacer structure and the first drift region; and
a second gate oxide layer, wherein a part of the second gate oxide layer is sandwiched between the second spacer structure and the first drift region, and the first insulation structure is sandwiched between the first gate oxide layer and the second gate oxide layer.