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Proceedings Paper

Calibration of CD mask standards for the 65-nm node: CoG and MoSi
Author(s): J. Richter; T. Heins; R. Liebe; B. Bodermann; A. Diener; D. Bergmann; C. G. Frase; H. Bosse
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Paper Abstract

We report on the traceable calibration of linewidth (CD) photomask standards which are used as reference standards for production masks of the 65 nm node. Two different types of masks with identical layout were produced and calibrated, namely a binary mask (CoG) and a half-tone phase shifting mask (193MoSi PSM). We will in particular describe the applied calibration procedures and cross-correlate the results from different high resolution metrology tools, like SEM, UV microscopy and AFM. The layout of the CD photomask standard contains isolated as well as dense line features in both tones with nominal CD down to 100 nm. Calibration of the standards was performed at PTB by UV microscopy and LV-SEM, supported by additional AFM measurements. For analysis of the measured high resolution microscopy images and the deduced profiles appropriate signal modeling was applied for every metrology tool, which allows a meaningful comparison of geometrical parameters of the measured calibration structures. By this approach, e.g. the deduced feature widths at the top of the structures and the widths at 50% height of the structures can be related to the measured edge angles. The linearity e. g. of the measured top CD on different type of structures on the CoG CD standard was determined to be below 5 nm down to line feature dimensions well below 200 nm.

Paper Details

Date Published: 3 May 2007
PDF: 10 pages
Proc. SPIE 6533, 23rd European Mask and Lithography Conference, 65330S (3 May 2007); doi: 10.1117/12.736931
Show Author Affiliations
J. Richter, Advanced Mask Technology Ctr. (Germany)
T. Heins, Advanced Mask Technology Ctr. (Germany)
R. Liebe, Advanced Mask Technology Ctr. (Germany)
B. Bodermann, Physikalisch-Technische Bundesanstalt (Germany)
A. Diener, Physikalisch-Technische Bundesanstalt (Germany)
D. Bergmann, Physikalisch-Technische Bundesanstalt (Germany)
C. G. Frase, Physikalisch-Technische Bundesanstalt (Germany)
H. Bosse, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 6533:
23rd European Mask and Lithography Conference
Uwe F. W. Behringer, Editor(s)

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