Patent ID: 9337262
Filing Date: 2016-05-10
CPC Classification: H01L,H03K

Claim Text:
1. A semiconductor device comprising: first and second charge-carrier emission structures on first and second opposed faces of a semiconductor die; first and second semiconductor control regions which are located on said first and second faces respectively, and are each positioned to control emission of first-polarity charge-carriers from said first and said second emission structures respectively; a first field-limiting ring structure, on said first face, which laterally surrounds said first emission structure; a second field-limiting ring structure, on said second face, which laterally surrounds said second emission structure; wherein said first emission structure and said first control region collectively include at least three doping components, including shallow p-type and n-type components, which each have the same profile as a corresponding respective doping component of said second field-limiting ring structure, and also includes at least one other doping component which does not have the same profile as any component of said second field-limiting ring structure; and wherein said second emission structure and said second control region collectively include at least three doping components, including shallow p-type and n-type components, which each have the same profile as a corresponding respective doping component of said first field-limiting ring structure, and also includes at least one other doping component which does not have the same profile as any component of said first field-limiting ring structure; whereby said field-limiting ring structures, in combination, smooth lateral voltage profiles between said emission structures and an edge of the die.