A wafer structure comprises a semiconductor wafer having a first side opposite a second side in a longitudinal direction. The wafer structure also comprises active circuitry formed on the first side of the semiconductor wafer. The active circuitry demarcates a voltage boundary between a first voltage zone and a second voltage zone in the semiconductor wafer. The wafer structure further includes an insulation layer including an insulation coating and an insulation barrier. The insulation coating is formed on the second side of the semiconductor wafer and extends to an insulation surface in the longitudinal direction. The insulation barrier extends from the insulation surface to the first side of the semiconductor wafer at the voltage boundary. The wafer structure yet further includes a conductive coating layer formed proximate to the insulation surface of a conductive coating material.