Patent ID: 8410553
Filing Date: 2013-04-02
Classification: H01L

Abstract:
1. A high voltage device comprising: a substrate with a device region defined thereon; a first isolation structure in the substrate, the first isolation structure comprising first and second opposing sidewalls and a bottom portion connecting the first and second sidewalls; a gate stack disposed on the substrate in the device region, the gate stack having first and second opposing sides, the first side being adjacent to the first isolation structure; a channel region located in the substrate beneath the gate stack; a first diffusion region located in the substrate, the first isolation region is separated from the channel by the first isolation structure; and a first drift region in the substrate coupling the channel to the first diffusion region, wherein the first drift region comprising a non-uniform depth profile conforming to the profile of the bottom portion and the first sidewall, and at least a portion of the profile of the second sidewall of the first isolation structure.