Patent ID: 7923350

Claim:
A method of manufacturing a semiconductor device, comprising: providing a wafer having a first face and a second face opposite the first face; selectively doping the wafer via the first face to selectively form etch stop regions in the wafer, wherein selectively doping the wafer comprises: accelerating ions toward the first face of the wafer to selectively form etch stop regions that are between the first face and the second face and not on the first face; providing active areas on the first face of the wafer; attaching the wafer at the first face to a wafer carrier; etching the wafer at the second face to the etch stop regions; and removing, from the wafer carrier, a semiconductor device that includes one of the active areas at a first outward facing face of the semiconductor device and one of the etch stop regions at a second outward facing face of the semiconductor device.