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Proceedings Paper

FAST-LH: a manufacturing-environmental friendly method of lens heating monitoring
Author(s): Siew Ing Yet; Faith Lim
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Paper Abstract

Lens heating monitoring is crucial for photolithography process control; ineffective lens heating compensation will cause severe focus and image drift on photoresist pattern. Conventional/standard lens heat-test recommended by equipment vendor normally requires long measuring time which is not manufacturing-environmental friendly, and it is designed more to equipment perspective. A fast and accurate method of lens heating monitoring (FAST-LH) is discussed in this paper. Focus drift induced by lens heating is measured using both conventional and FAST-LH; result comparison shows strong correlation of focus drift with the new measuring method. Detailed methodology for the lens heating monitoring is studied; a fine tuned new measuring method is proven to be not only fast but also accurate to monitor lens heating LC compensation rate. Compared to the conventional method, FAST-LH could reflect better the actual focus drift under manufacturing environment. Due to the limitation of transforming the FAST-LH to equipment LH compensation settings, the FASTLH is implemented for periodic monitoring and feedback; whereas the conventional method is used during compensation/corrective action.

Paper Details

Date Published: 14 December 2009
PDF: 7 pages
Proc. SPIE 7520, Lithography Asia 2009, 75202J (14 December 2009); doi: 10.1117/12.836991
Show Author Affiliations
Siew Ing Yet, X-FAB Sarawak Sdn. Bhd. (Malaysia)
Faith Lim, X-FAB Sarawak Sdn. Bhd. (Malaysia)

Published in SPIE Proceedings Vol. 7520:
Lithography Asia 2009
Alek C. Chen; Woo-Sung Han; Burn J. Lin; Anthony Yen, Editor(s)

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