Patent ID: 8759912
Filing Date: 2014-06-24
Classification: H01L

Abstract:
1. A high-voltage transistor device, comprising: a semiconductor layer of a first conductivity type; a source region of a second conductivity type opposite to the first conductivity type in the semiconductor layer; a drain region of the second conductivity type in the semiconductor layer separated from the source region; a first isolation layer atop the semiconductor layer between the source region and the drain region; a first well region of the second conductivity type surrounding the drain region, extending towards the source region and separated from the source region; a gate atop the first isolation layer between the source region and the first well region; a spiral resistive field plate atop the first isolation layer between the drain region and the gate, wherein the spiral resistive field plate comprises a first end and a second end; a first dielectric layer covering the source region, the drain region, the first isolation layer, the gate and the spiral resistive field plate; a source electrode electrically coupled to the source region and the first end of the spiral resistive field plate; a drain electrode electrically coupled to the drain region and the second end of the spiral resistive field plate; and a plurality of first field plates atop the first dielectric layer, wherein the plurality of first field plates are arranged around the source electrode, starting from the source electrode and extending towards the drain electrode, wherein the plurality of first field plates are isolated from each other, wherein a starting first field plate of the plurality of first field plates is connected to the source electrode, wherein each of the plurality of first field plates covers one or more segments of the spiral resistive field plate.