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Proceedings Paper

Effects of laser bandwidth on iso-dense bias and line end shortening at sub-micron process nodes
Author(s): R. C. Peng; A. K. Yang; L. J. Chen; Y. W. Guo; H. H. Liu; John Lin
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Paper Abstract

Control of Isolated and Dense line Bias (IDB) and Line End Shortening (LES) in a lithographic process has become increasingly important, particularly for the 65nm node and below. The IDB depends on many factors, for example, focus, lens aberrations, partial coherence and laser spectral bandwidth. This work studies the impact to IDB and LES from changes in laser bandwidth at two sub-micron process nodes. Careful measurements of both FWHM and E95 bandwidth parameters of the laser spectral profile were carried out using two types of spectrometers. The spectral bandwidth was adjusted over a larger range than normally experienced during wafer exposures by carefully varying the laser operating conditions to provide controlled changes in bandwidth while maintaining all other laser performance parameters within specification. Measurements of both linewidth and LES on several substrates were made and correlated with laser bandwidth to determine the sensitivity of IDB and LES to bandwidth variation. The sensitivity of different structures to E95 bandwidth variation was assessed

Paper Details

Date Published: 27 March 2007
PDF: 8 pages
Proc. SPIE 6520, Optical Microlithography XX, 65203S (27 March 2007); doi: 10.1117/12.713080
Show Author Affiliations
R. C. Peng, TSMC Corp. (Taiwan)
A. K. Yang, TSMC Corp. (Taiwan)
L. J. Chen, TSMC Corp. (Taiwan)
Y. W. Guo, TSMC Corp. (Taiwan)
H. H. Liu, TSMC Corp. (Taiwan)
John Lin, TSMC Corp. (Taiwan)

Published in SPIE Proceedings Vol. 6520:
Optical Microlithography XX
Donis G. Flagello, Editor(s)

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