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2 April 2007 Study on the reduction of defects in immersion lithography
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ArF Immersion lithography is expected to be a production-worthy technology for sub-60nm DRAM. It gives wider process window and better CD uniformity at the cost of defects and overlay accuracy. It is generally mentioned that immersion defects are generated during exposure and removed through pre-soak and post-soak process. A lot of efforts are being made towards less defect generation during exposure and more defect removal through pre-soak and postsoak process. We have experienced a variety of immersion defects and classified them into four types: bubble defect, water mark defect (T-top & Stain), swelling defect and bridge defect (Macro & Micro). We have worked very hard to reduce each immersion defects with immersion exposure and system. In this paper, we investigate method to reduce each immersion defects: bubble, water mark, swelling and bridge through our experiment.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Keundo Ban, Sarohan Park, Cheolkyu Bok, Heeyoul Lim, Junggun Heo, Hyunsook Chun, Junghyun Kang, and Seungchan Moon "Study on the reduction of defects in immersion lithography", Proc. SPIE 6519, Advances in Resist Materials and Processing Technology XXIV, 65191V (2 April 2007);

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