Patent ID: 7453127

Claim:
A high-voltage metal-oxide-semiconductor device, comprising: a gate structure overlying a semiconductor substrate; a pair of insulator spacers on the sidewalls of said gate structure respectively; wherein the height of the pair of insulator spacers is less than or equal to the height of the gate structure; a pair of floating non-insulator spacers enrolled within said pair of insulator spacers respectively such that the height of the floating non-insulator spacers is less than that of the gate structure, wherein each of said floating non-insulator spacers is insulated from said gate structure and said semiconductor substrate by said insulator spacer, and said gate structure does not overlap said insulator spacers and said floating non-insulator spacers; a first diffusion extension region with one end aligned with one sidewall of said gate structure and the other end aligned with a field oxide region formed in said semiconductor substrate; a drain region in said diffusion extension region, wherein a distinct dosage difference exists between said first diffusion extension region and said drain region to construct a double-diffused-drain (DDD) region.