28 March 2018 Overlay of multiframe SEM images including nonlinear field distortions
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To reduce charging and shrinkage, CD-SEMs utilize low electron energies and multiframe imaging. This results in every next frame being altered due to stage and beam instability, as well as due to charging. Regular averaging of the frames blurs the edges; this directly effects the extracted values of critical dimensions. A technique was developed to overlay multiframe images without the loss of quality. This method takes into account drift, rotation, and magnification corrections, as well as nonlinear distortions due to wafer charging. A significant improvement in the signal to noise ratio and overall image quality without degradation of the feature’s edge quality was achieved. The developed software is capable of working with regular and large size images up to 32K pixels in each direction.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Babin, S. Babin, S. Borisov, S. Borisov, I. Ivonin, I. Ivonin, S. Nakazawa, S. Nakazawa, Y. Yamazaki, Y. Yamazaki, } "Overlay of multiframe SEM images including nonlinear field distortions", Proc. SPIE 10585, Metrology, Inspection, and Process Control for Microlithography XXXII, 105852B (28 March 2018); doi: 10.1117/12.2299847; https://doi.org/10.1117/12.2299847


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