Patent ID: 8264040
Filing Date: 2012-09-11
Classification: H01L

Abstract:
1. A lateral power transistor comprising: a semiconductor layer, in the semiconductor layer: a source zone of a first conduction type, a drain zone arranged at a distance from the source zone in a lateral direction of the semiconductor layer, a drift zone adjacent to the drain zone in the direction of the source zone, and a body zone of a second conduction type complementary to the first conduction type, said body zone being arranged between the drift zone and the source zone, an electrode layer, which is dielectrically insulated from the semiconductor layer and which forms a gate electrode in a first section and a field plate in a second section, wherein the gate electrode is arranged adjacent to the body zone and an accumulation section of the drift zone and is insulated from the semiconductor layer by means of a gate dielectric layer, and wherein the field plate is arranged adjacent to a further section of the drift zone and is insulated from the semiconductor layer by means of a field plate dielectric layer, which is thicker than the gate dielectric layer, wherein the gate electrode has a first gate electrode section and a second gate electrode section, the second gate electrode section being arranged between the first gate electrode section and the field plate, and wherein wherein the first and the second gate electrode sections are each insulated from the semiconductor layer by the gate dielectric layer that is thinner than the field plate dielectric layer such that the gate dielectric layer has a substantially uniform thickness for both the first and the second gate electrode sections; and wherein the first height level, the second height level and the first intermediate level are defined by that side of the gate dielectric layer facing away from the semiconductor layer.