CD metrology by an immersion microscope with high NA condenser lens for 45-nm generation masks

Takeshi Yamane; Rikiya Taniguchi; Takashi Hirano

doi:10.1117/12.728950

14 May 2007 CD metrology by an immersion microscope with high NA condenser lens for 45-nm generation masks

Takeshi Yamane, Rikiya Taniguchi, Takashi Hirano

Proceedings Volume 6607, Photomask and Next-Generation Lithography Mask Technology XIV; 660711 (2007) https://doi.org/10.1117/12.728950
Event: Photomask and Next-Generation Lithography Mask Technology XIV, 2007, Yokohama, Japan

Abstract

An immersion microscope with high NA condenser lens is evaluated. The effects of high NA condenser lens are studied with simulation and experiment. The one effect is CD linearity improvement. We have already reported that our calibration method improves CD linearity of an immersion microscope. The simulation result indicates the high NA condenser lens improves the accuracy of the calibration method. The other effect is CD repeatability. The experimental result demonstrates the high NA condenser lens reduces the peak of intensity profile and improves CD repeatability. As the result, an immersion microscope with high NA condenser lens is available for CD measurement of 45 nm generation masks.

Citation Download Citation

Takeshi Yamane, Rikiya Taniguchi, and Takashi Hirano "CD metrology by an immersion microscope with high NA condenser lens for 45-nm generation masks", Proc. SPIE 6607, Photomask and Next-Generation Lithography Mask Technology XIV, 660711 (14 May 2007); https://doi.org/10.1117/12.728950

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