Patent ID: 9035415
Filing Date: 2015-05-19
Classification: H01L

Abstract:
1. A vertical semiconductor device, comprising: a cell region; a non-cell region disposed outside the cell region; and a diffusion layer disposed in at least part of the non-cell region, wherein when the vertical semiconductor device is viewed in a plane passing through the diffusion layer and the cell region, the diffusion layer has an impurity surface density higher than 1×10 wherein a substantially linear relation between the impurity surface density and a length of the vertical semiconductor device when viewed in the plane in a region in the diffusion layer that has the impurity surface density higher than that satisfying the RESURF condition has a greater mean gradient of the impurity surface density than a substantially linear relation between the impurity surface density and a length of the vertical semiconductor device when viewed in the plane in a region in the diffusion layer that has the impurity surface density lower that that satisfying a RESURF condition.