Patent ID: 9450045
Filing Date: 2016-09-20
CPC Classification: H01L

Claim Text:
1. A method for forming a lateral superjunction structure, comprising: providing a heavily doped semiconductor substrate of a first conductivity type; forming a lightly doped semiconductor layer of the first conductivity type on the substrate, the substrate and the lightly doped semiconductor layer forming a semiconductor base layer; forming a base epitaxial layer on the semiconductor base layer; performing N-type and P-type implantation into a first region of the base epitaxial layer to introduce both N-type and P-type dopants into the first region of the base epitaxial layer; repeating the forming a base epitaxial layer and the performing N-type and P-type implantation into the base epitaxial to form a plurality of implanted base epitaxial layers on the semiconductor base layer, the plurality of implanted base epitaxial layers forming a semiconductor structure having a first surface opposite the semiconductor base layer; and annealing the plurality of implanted base epitaxial layers to activate implanted dopants and to spread out the implanted dopants to form alternating N-type and P-type thin semiconductor regions in the semiconductor structure, wherein the alternating N-type and P-type thin semiconductor regions form the lateral superjunction structure, the alternating N-type and P-type thin semiconductor regions being formed in the first region and being formed parallel to the first surface of the semiconductor structure.