Patent ID: 9029215
Filing Date: 2015-05-12
Classification: H01L

Abstract:
1. A method for making an insulated gate semiconductor device having a shield electrode structure comprising the steps of: providing a region of semiconductor material having a major surface; forming a trench extending from the major surface into the region of semiconductor material; forming a first dielectric layer along surfaces of the trench; forming a first conductive layer adjacent the first dielectric layer, wherein the first conductive layer is configured as a shield electrode; removing portions of the first dielectric layer from upper sidewall surfaces of the trench; thereafter forming a gate dielectric layer along the upper sidewall surfaces of the trench; forming a first spacer layer adjacent the gate dielectric layer; forming a second dielectric layer overlying the first conductive layer, wherein the second dielectric layer is formed after the gate dielectric layer is formed; removing the first spacer layer, wherein the gate dielectric layer remains, at least in part, along the upper sidewall surfaces of the trench after the second dielectric layer is formed and after the first spacer layer is removed; and forming a second conductive layer adjacent the gate dielectric layer and the second dielectric layer, wherein the second conductive layer is configured as a control electrode.