Patent ID: 7861421

Claim:
A method for measuring a rotation angle of a bonded wafer by which at least a base wafer and a bond wafer each having a notch indicative of a crystal orientation formed at an outer edge thereof are bonded to each other at a desired rotation angle by utilizing the two notches and a rotation angle of the base wafer and the bond wafer in a bonded wafer manufactured by reducing a film thickness of the bond wafer is measured, the method comprising: observing a profile of the bond wafer having the reduced film thickness; calculating a positional direction of the notch of the bond wafer seen from a center of the bonded wafer by utilizing the observed profile of the bond wafer; calculating an angle formed between the calculated positional direction of the notch of the bond wafer and a positional direction of the notch of the base wafer; and measuring the rotation angle of the base wafer and the bond wafer.