2 May 2016 Intrafield overlay correction for illumination-based distortion
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The use of different illumination source shapes and multipatterning processes used to generate sub–40-nm images can create image placement errors level to level, resulting in significant intrafield overlay errors. These errors arise because of the impact of the different pupil shapes on lens aberrations resolving into image placement errors as well as because different tools will react differently to the same pupil shapes. We compare the impact of two extreme illumination sources on intrafield image placement and its effect on overall pattern overlay. We also discuss a method to empirically isolate and measure the amount of intrafield overlay distortion relative to a reference illumination source and then use the results to correct the resultant image placement errors.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Michael Pike, Michael Pike, Timothy Brunner, Timothy Brunner, Bradley Morgenfeld, Bradley Morgenfeld, Nan Jing, Nan Jing, Timothy Wiltshire, Timothy Wiltshire, } "Intrafield overlay correction for illumination-based distortion," Journal of Micro/Nanolithography, MEMS, and MOEMS 15(2), 021406 (2 May 2016). https://doi.org/10.1117/1.JMM.15.2.021406 . Submission:

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