METROLOGY MEASURING APPARATUS

The present disclosure provides a method and an apparatus for apparatus for accurately measuring and calibrating elemental concentration measurements for a semiconductor wafer. The apparatus includes an edxrf system for calculating an elemental concentration at a target area of the semiconductor wafer. The apparatus further includes an optical subsystem for calculating volumetric information of the target area of the semiconductor wafer. The elemental concentration may be calibrated by first correlating the elemental concentration measurements for a norm feature at the target area with the volumetric information for the norm feature of the target area to obtain a calibration data. Thereafter, the calibration data obtained is used to calibrate the elemental concentration measurements to achieve an accurate measurement thereof.