Patent ID: 7786533
Filing Date: 2010-08-31
Classification: H01L

Abstract:
1. A high-voltage transistor comprising: a substrate having a top surface; a drain of a first conductivity type; a plurality of source regions of the first conductivity type; a plurality of drift regions of the first conductivity type, each extending in a vertical direction from the drain toward the source, adjacent ones of the drift regions being separated in a first lateral direction by a dielectric layer, each of the drift regions terminating in a second lateral direction in a fingertip area; a plurality of body regions of a second conductivity type, each body region separating a corresponding one of the source regions from a corresponding one of the drift regions; a field plate member disposed within the dielectric layer that surrounds each of the drift regions in the first and second lateral directions, the field plate member having an entire length that extends in the vertical direction from a beginning at the top surface of the substrate downward to a farthest end of the field plate member, an inner region of the dielectric layer laterally separating the drift regions from the field plate member and an outer region of the dielectric layer laterally separating the field plate member from a perimeter semiconductor region of the substrate that extends in the vertical direction downward from the top surface, the perimeter semiconductor region being of the first conductivity type, the inner and outer regions each having a width that is substantially the same at all points along the entire length of the field plate member; and a plurality of gates, each gate being disposed in the dielectric layer adjacent to and insulated from a corresponding one of the body regions, application of a voltage potential to the gate causing a vertical conduction channel to form in the body region such that current flows between the source regions and the drain when the high-voltage transistor is in an on-state.