
Proceedings Paper
In-line focus-dose monitoring for hyper NA imagingFormat | Member Price | Non-Member Price |
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Paper Abstract
The merits of hyper NA imaging using 193nm exposure wavelength with water immersion for 45nm is clear. Scanner
focus and dose control is always improving to allow small DOF manufacturing in immersion lithography. However,
other process parameters can affect focus and dose control and a real-time monitor capability to detect local focus and
exposure conditions on production wafers is required. In this paper we evaluated a focus-exposure monitor technique
based on Spectroscopic Critical Dimension (SCD) metrology following the promising results obtained by Kelvin Hung
[1] et al. The key attributes of this technique are the implementation on standard production wafers, the high sensitivity
to pattern profile modifications and the unique capability of spectroscopic ellipsometry to provide all the information
needed to decouple the effects on pattern formation coming from process variations of Advanced Patterning Films (APF)
[2], largely adopted for 65/45nm patterning, from coating and, finally, from the pure scanner imaging contributors like
focus and exposure. We will present the characterization of this technique for 2 critical layers: active and contacts of a
non-volatile memory device, 45nm technology.
Paper Details
Date Published: 25 March 2008
PDF: 15 pages
Proc. SPIE 6922, Metrology, Inspection, and Process Control for Microlithography XXII, 69223H (25 March 2008); doi: 10.1117/12.772904
Published in SPIE Proceedings Vol. 6922:
Metrology, Inspection, and Process Control for Microlithography XXII
John A. Allgair; Christopher J. Raymond, Editor(s)
PDF: 15 pages
Proc. SPIE 6922, Metrology, Inspection, and Process Control for Microlithography XXII, 69223H (25 March 2008); doi: 10.1117/12.772904
Show Author Affiliations
Sara Loi, STMicroelectronics (Italy)
Alejandro Fasciszewski Zeballos, STMicroelectronics (Italy)
Umberto Iessi, STMicroelectronics (Italy)
John Robinson, KLA-Tencor Corp. (United States)
Alejandro Fasciszewski Zeballos, STMicroelectronics (Italy)
Umberto Iessi, STMicroelectronics (Italy)
John Robinson, KLA-Tencor Corp. (United States)
Published in SPIE Proceedings Vol. 6922:
Metrology, Inspection, and Process Control for Microlithography XXII
John A. Allgair; Christopher J. Raymond, Editor(s)
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