Patent ID: 9368617
Filing Date: 2016-06-14
CPC Classification: H01L

Claim Text:
1. A superjunction device, which comprises: a drain region of a first conduction type; a body region of a second conduction type; a drift region located between said body region and said drain region, the drift region comprises first regions of a first conduction type and second regions of a second conduction type arranged alternately along a direction being perpendicular to the direction from the body region to the drain region; a plurality of trench gate structures, each of them comprising a trench extending into said drift region from an upper surface of said body region and a gate electrode in said trench surrounded by a first dielectric layer filling said trench, thereby defining a vertical interface between the first dielectric layer and the body region having an interface length, wherein a summation of the interface lengths defined by each of the plurality of trench gate structures comprises a total interface length of the superjunction device; and a source region of a first conduction type embedded into said body region; wherein there is no source region along at least 10% of the total interface length between the first dielectric layer and the body region, wherein there is no source region on at least one side of at least 25% of said plurality of trench gate structures.