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Current trends in 157 nm dry lithography
Lithography at 157 nm using F 2 laser is the next step after 193 nm for ULSI fabrication with dimensions below 50 nm. However, there are certain issues to be addressed before the acceptance of the technology by the industry. The most important are: (1) design of resists with low absorption and outga...
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Published in: | Applied surface science 2005-07, Vol.247 (1), p.577-583 |
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Main Author: | |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | Lithography at 157
nm using F
2 laser is the next step after 193
nm for ULSI fabrication with dimensions below 50
nm. However, there are certain issues to be addressed before the acceptance of the technology by the industry. The most important are: (1) design of resists with low absorption and outgassing at 157
nm, (2) improved line edge roughness and resolution and (3) defect-free resist surface following illumination at 157
nm. In this communication it has been confirmed theoretically and experimentally that outgassing of resists at 157
nm is an intrinsic molecular property and does not depend on the laser parameters. Based on a theoretical model, a new method for measuring outgassing of resists has been developed by measuring the thickness loss, following illumination at 157
nm, using vacuum ultraviolet absorption spectroscopy and atomic force microscopy. |
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ISSN: | 0169-4332 1873-5584 |
DOI: | 10.1016/j.apsusc.2005.01.139 |