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Proceedings Paper

Advantages and limitations of density functional theory in block copolymer directed self-assembly
Author(s): Jimmy Liu; Nabil Laachi; Kris T. Delaney; Glenn H. Fredrickson
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Paper Abstract

A major challenge in the application of block copolymer directed self-assembly (DSA) to advanced lithography is the exploration of large design spaces, including the selection of confinement shape and size, surface chemistry to affect wetting conditions, copolymer chain length and block fraction. To sweep such large spaces, a computational model is ideally both fast and accurate. In this study, we investigate various incarnations of the density functional theory (DFT) approach and evaluate their suitability to DSA applications. We introduce a new optimization scheme to capitalize on the speed advantages of DFT, while minimizing loss of accuracy relative to the benchmark of self-consistent field theory (SCFT). Although current DFT models afford a 100-fold reduction in computational complexity over SCFT, even the best optimized models fail to match SCFT density profiles and make extremely poor predictions of commensurability windows and defect energetics. These limitations suggest that SCFT will remain the gold standard for DSA simulations in the near future.

Paper Details

Date Published: 19 March 2015
PDF: 10 pages
Proc. SPIE 9423, Alternative Lithographic Technologies VII, 94231I (19 March 2015); doi: 10.1117/12.2085666
Show Author Affiliations
Jimmy Liu, Univ. of California, Santa Barbara (United States)
Nabil Laachi, Univ. of California, Santa Barbara (United States)
Kris T. Delaney, Univ. of California, Santa Barbara (United States)
Glenn H. Fredrickson, Univ. of California, Santa Barbara (United States)

Published in SPIE Proceedings Vol. 9423:
Alternative Lithographic Technologies VII
Douglas J. Resnick; Christopher Bencher, Editor(s)

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