Patent ID: 8906777
Filing Date: 2014-12-09
Classification: H01L

Abstract:
1. A method for evaluating a shape change of a semiconductor wafer, comprising the steps of: acquiring unconstrained shape data of a circumferential edge part of the semiconductor wafer being placed on a reference surface in a unconstrained state, the unconstrained shape data being measured along a plurality of radial lines spaced around a circumference of the semiconductor wafer; acquiring constrained shape data of the circumferential edge part of the semiconductor wafer being constrained along the reference surface in a constrained state, the constrained shape data being measured along the plurality of radial lines spaced around the circumference of the semiconductor wafer; and comparing the unconstrained shape data and the constrained shape data, which represent unconstrained and constrained shapes of the semiconductor wafer along the plurality of radial lines, so as to evaluate the shape change quantitatively, wherein the comparing step includes integrating a difference between the unconstrained shape data and the constrained shape data along the radial line of the semiconductor wafer.