Patent ID: 8044458
Filing Date: 2011-10-25
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor body defining a trench structure having walls; a plurality of vertical gate zones each having a gate electrode and a gate oxide that covers the walls of the trench structure; a body zone of a first conduction type arranged between two of the gate zones; a drift zone of a complementary conduction type with respect to the first conduction type vertically adjoining the body zone; floating shielding zones of the first conduction type arranged adjacent to the gate zones, the shielding zones extending into the semiconductor body deeper than the trench structure of the gate zones and having a pn junction with the drift zone below the trench structure; and a buried dopant zone of the same charge type as the drift zone having a higher impurity concentration than the drift zone arranged in a space charge region of the pn junction at a distance from the trench bottom of the trench structure.