Patent ID: 6963630

Claim:
A method for evaluating an SOI layer on an insulating film disposed on a base substrate so as to construct an SOI substrate, comprising: measuring a first diffraction intensity distribution of an X-ray beam for an incident beam angle formed with the X-ray beam and a front surface of the SOI substrate by irradiating the X-ray beam onto a front surface of the base substrate; measuring a second diffraction intensity distribution of the X-ray beam for the incident beam angle by irradiating the X-ray beam onto the front surface of the SOI substrate; determining an evaluation diffraction peak corresponding to the SOI layer from the first and the second diffraction intensity distributions; and observing an X-ray topograph by irradiating the X-ray beam on the SOI layer with an incident beam angle of the evaluation diffraction peak, after adjusting a rotation angle around an axis perpendicular to the front surface of the SOI substrate, a tilt angle around a horizontal axis along an incident direction of the X-ray beam, and the incident beam angle of the evaluation diffraction peak.