Abstract
Surface topography of the rough side of a silicon wafer is characterized using an atomic force microscope (AFM). The slope distribution calculated from the measured surface profiles deviates significantly from the Gaussian distribution. The experimentally obtained slope distribution is incorporated into a geometric-optics model to predict the bidirectional reflectance distribution function (BRDF) of the rough surface. Comparison has been made between the predicted BRDF and that measured with a recently built bidirectional scatterometer, at 635 nm and 785 nm for different incoming angles. The trends agree well between the predicted and measured BRDFs, especially for the parallel-polarized incidence (p-polarization), although relatively large discrepancies exist near the specular peak and at large reflection angles. This work offers a plausible explanation of the second non-specular peak in the observed BRDF as associated with the subsidiary maximum in the slope distribution. Anisotropic features have been found both in the calculated slope distributions and the measured BRDFs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.