Patent ID: 7209857
Filing Date: 2007-04-24
Classification: G01B

Abstract:
1. A method of evaluating a shape of a semiconductor wafer comprising the steps of: measuring shape data of a semiconductor wafer by scanning a front surface and/or a back surface of the semiconductor wafer; calculating a differential profile through a differential process of the measured shape data; analyzing the obtained differential profile and obtaining a surface characteristic of the wafer to quantify a shape of the wafer; evaluating a shape of the semiconductor wafer, wherein the shape data of the semiconductor wafer displacement data of a plane of the semiconductor wafer and/or thickness data of the semiconductor wafer; and the displacement data of the plane of the semiconductor wafer are displacement of a plane in a direction of thickness in the front surface or the back surface of the wafer when the semiconductor wafer is placed without suction; or the thickness data of the semiconductor wafer are displacement of a plane in a direction of thickness in one main surface of the wafer when an entire of another main surface of the semiconductor wafer is sucked; or the displacement data of the plane of the semiconductor wafer are displacement of planes in a direction of thickness in the front surface and the back surface of the wafer when a part of the semiconductor wafer is sucked with a wafer holder, and the thickness data of the semiconductor wafer are difference of the displacement data of planes in the front surface and the back surface of the wafer when a part of the semiconductor wafer is sucked.