Patent ID: 7795083

Claim:
A method for forming a semiconductor structure, comprising: providing a first conductivity type substrate; forming a plurality of first conductivity type well regions in the first conductivity type substrate by doping a first conductivity type dopant in the first conductivity type substrate; forming a plurality of second conductivity type well regions and a plurality of second conductivity type bar doped regions in the first conductivity type substrate by a doping process using a mask; diffusing the second conductivity type bar doped regions to form a second conductivity type continuous region by annealing, wherein the second conductivity type continuous region adjoins the first conductivity type well regions, and a second conductivity type dopant concentration of the second conductivity type continuous region is smaller than a second conductivity type dopant concentration of the second conductivity type bar doped regions; and forming a second conductivity type source/drain region in the second conductivity type well region.