Patent ID: 9012988
Filing Date: 2015-04-21
Classification: H01L

Abstract:
1. A semiconductor device, comprising: an isolation structure formed in a substrate to define an active region of the substrate, wherein the active region has a field plate region therein; a step gate dielectric structure formed on the substrate in the field plate region, wherein the step gate dielectric structure comprises: a gate dielectric layer on the substrate in the active region, extended to cover a portion of the active region adjacent to the step gate dielectric structure to a top surface of the step gate dielectric structure, wherein the top surface of the step gate dielectric structure and the gate dielectric layer have an overlapping region therebetween and a non-overlapping region in which the top surface of the step gate dielectric structure and the gate dielectric layer do not contact, wherein the top surface of the step gate dielectric structure is on an opposite side of the step gate dielectric structure from the substrate.