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Study of Line-Space Pitch Multiplication Using Graphoepitaxy Directed Self-Assembly for Semiconductor Applications

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Abstract

Directed self-assembly (DSA) of block co-polymers (BCPs) has attracted intensive attention in both academia and industry in recent years. As a versatile and complimentary patterning technique for advanced technology nodes, DSA could be used to pattern line/space and contact holes for electronic devices at the 7-nm technology node and beyond. In this paper, we systematically investigated the key parameters affecting the formation of defect-free DSA line/space patterns with the graphoepitaxy approach, which included the role of surface affinity of the pre-pattern, the critical dimension commensurability between the pre-pattern and the intrinsic pitch of lamellar BCP, the thickness effect of BCP and, more importantly, the pattern transfer from BCP to the underlying Si substrate. After process optimization, the 35-nm pitch (line width ∼16 nm) line/space patterns were successfully transferred to a Si substrate from the 200-nm pitch (space width ∼90 nm) pre-patterns established by conventional ArF lithography.

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Authors and Affiliations

  1. Institute of Microelectronics, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-02, Innovis Tower, Singapore, 138634, Singapore

    Shijie Wang, Wei Deng, Yong Ann Seow, Bing Chen & Qun Ying Lin

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  1. Shijie Wang
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  2. Wei Deng
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Correspondence to Shijie Wang.

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Wang, S., Deng, W., Seow, Y.A. et al. Study of Line-Space Pitch Multiplication Using Graphoepitaxy Directed Self-Assembly for Semiconductor Applications. J. Electron. Mater. 46, 4405–4413 (2017). https://doi.org/10.1007/s11664-017-5431-y

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  • DOI: https://doi.org/10.1007/s11664-017-5431-y

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