24 March 2006 The study to enhance the accuracy of FIB repair on mask pattern of DRAM
Author Affiliations +
As pattern size is shrinking, required mask specification is tighter and defect on mask is easily transferred to wafer. It is difficult to distinguish a defect what it is and where it is from, even though high NA optic lens is used. According to small pattern size and attenuated PSM material of ArF area, image quality of FIB (focused ion beam microscopy) to repair defect is getting worse. But, recently, SEM (Secondary Electron Microscopy) review tool is used to overcome the limited resolution of optic microscope such as review mode of inspection tool. To use this higher image quality of SEM compared to FIB process, we introduce image processing and replacement to enhance the accuracy of FIB repair on mask pattern. As the image of ion beam generally shows speckle noise, we adopted AND (anisotropic nonlinear diffusion) technology to remove noise without loss of pattern, by different diffusion along pattern edge. Using this AND technique, we enhanced the image quality of FIB and SEM, and productivity of FIB.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yongkyoo Choi, Heecheon Kim, Sangchul Kim, Oscar Han, "The study to enhance the accuracy of FIB repair on mask pattern of DRAM", Proc. SPIE 6152, Metrology, Inspection, and Process Control for Microlithography XX, 61522H (24 March 2006); doi: 10.1117/12.656270; https://doi.org/10.1117/12.656270


Image vectorization using blue-noise sampling
Proceedings of SPIE (March 21 2013)
Enhancement of image edge sharpness and acutance
Proceedings of SPIE (April 04 1997)
Image enhancement technology to get fine defect image for FIB
Proceedings of SPIE (November 04 2005)
Fingerprint image enhancement via log-Gabor filtering
Proceedings of SPIE (December 08 2011)

Back to Top