Patent ID: 9691754
Date: 2017-06-27
CPC Classifications: H01L

Claim:
1. A semiconductor structure, comprising: a well having a first doping type; a first lightly doped region disposed in the well, the first lightly doped region having a second doping type; a second lightly doped region disposed in the well and separated from the first lightly doped region, the second lightly doped region having the second doping type; a first heavily doped region disposed in the first lightly doped region, the first heavily doped region having the second doping type, wherein the first lightly doped region covers at least a bottom surface of the first heavily doped region; a second heavily doped region partially disposed in the second lightly doped region, the second heavily doped region having the second doping type, wherein the second heavily doped region has a surface contacting the well; and a gate disposed above a region of the well which is located between the first heavily doped region and the second heavily doped region; wherein the second heavily doped region has a first sidewall and a second sidewall, the first sidewall is near the gate, the second sidewall is far from the gate, the first sidewall of the second heavily doped region contacts the well, and the second sidewall and a portion of the bottom surface of the second heavily doped region are encompassed by the second lightly doped region.