期刊
ACS NANO
卷 8, 期 10, 页码 10009-10018出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn504995c
关键词
immersion; sub-15 nm; polymer; self-assembly; lithography
类别
资金
- Global Frontier Program through Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013M3A6B1078874]
The directed self-assembly (DSA) of block copolymers (BCPs) is expected to complement conventional optical lithography due to its excellent pattern resolution and cost-effectiveness. Recent studies have shown that BCPs with a large Flory-Huggins interaction parameter (gamma) are critical for a reduction of the thermodynamic defect density as well as an increase in pattern density. However, due to their slower self-assembly kinetics, high-gamma BCPs typically necessitate solvent vapor annealing, which requires complex facilities and procedures compared to simple thermal annealing. Here, we introduce an immersion-triggered directed self-assembly (iDSA) process and demonstrate the combined advantages of excellent simplicity, productivity, large-area capability, and tunability. We show that the vapor-free, simple immersion of high-gamma BCPs in a composition-optimized mixture of nonswelling and swelling solvents can induce the ultrafast (=5 min) formation of nanoscale patterns with a pattern size ranging from 8-18 nm. Moreover, iDSA enables the reversible formation of seven different nanostructures from one sphere-forming BCP, demonstrating the outstanding controllability of this self-assembly route.
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