Patent ID: 7123358

Claim:
A method of inspection of an ion implanted semiconductor wafer, comprising: a) illuminating a surface of the ion implanted semiconductor wafer with a flood illumination of monochromatic light of wavelength λ l , the flood illumination illuminating at least an area A of the wafer, the implanted surface having Raman active features induced by the ion implantation; then b) imaging the implanted surface of the wafer using light scattered from the wafer of a wavelength which is Raman shifted in frequency from the light of wavelength λ l ; c) illuminating an area A of the surface of a featureless uniformly Raman Scattering material with the same illumination system as step a); then d) imaging the area A of the surface of the featureless uniformly Raman Scattering material using light scattered from the surface of the uniformly Raman Scattering material of a wavelength which is Raman shifted in frequency from the light of wavelength λ l , the light imaged with the same imaging system as step (b); and e) correcting the image of the implanted area using the results of the imaging of the area of the surface of the uniformly Raman Scattering material.