Patent ID: 8563377

Claim:
A semiconductor device comprising: a first trench disposed in a semiconductor region and aligned along a first direction from an end of the first trench disposed in a connection region to a portion of the first trench disposed in an active region, the first trench having: a dielectric layer lining a sidewall of the first trench, and a shield electrode disposed in the first trench, a second trench disposed in the semiconductor region and aligned parallel to the first trench, the second trench having: a dielectric layer lining a sidewall of the second trench, and a shield electrode disposed in the second trench; a first well region of a first conductivity type having at least a portion disposed in the active region and extending between the sidewall of the first trench and the sidewall of the second trench along a second direction orthogonal to the first direction, the first well region having an end in the connection region; and a second well region of the first conductivity type and having a doping concentration lower than a doping concentration of the first well region, the second well region extending between the sidewall of the first trench and the sidewall of the second trench along the second direction, and extending along the first direction from the end of the first trench to the end of the first well region.