Patent ID: 8703547

Claim:
A method of manufacturing a thyristor, the method comprising: forming a first well of a first conductivity type and a second well of a second conductivity type in a substrate; forming a first doped region of the second conductivity type in the first well and forming a second doped region of the first conductivity type in the second well; forming a halo implantation region of the second conductivity type in the second well, the halo implantation region being located between the first and second doped regions; forming, between the first and second doped regions, a special doped region of the first conductivity type comprising a heavily doped portion and a lightly doped portion, the lightly doped portion being located above and connected to the halo implantation region; and isolating the heavily doped portion from the first doped region by a first shallow trench isolation and isolating the lightly doped portion and the halo implantation region from the second doped region by a second shallow trench isolation, the second shallow trench isolation being in contact with at least a portion of each of the lightly doped portion and the halo implantation region, wherein the halo implantation region and the lightly doped portion are formed by using a same photomask.