Abstract
Directed self-assembly of block copolymers (BCPs) is a process that has received great interest in the field of nanomanufacturing in the past decade, and great strides towards forming high quality aligned patterns have been made. But state of the art methods still yield defectivities orders of magnitude higher than is necessary in semi-conductor fabrication even though free energy calculations suggest that equilibrium defectivities are much lower than is necessary for economic semi-conductor fabrication. This disparity suggests that the main problem may lie in the kinetics of defect removal. This work uses a coarse-grained model to study the rates, pathways, and dependencies of healing a common defect to give insight into the fundamental processes that control defect healing and give guidance on optimal process conditions for BCP-DSA. It is found that infinitely thick films yield an exponential drop in defect heal rate above ΧN ∼ 30. Below ΧN ∼ 30, the rate of transport was similar to the rate at which the transition state was reached so that the overall rate changed only slightly. The energy barrier in periodic simulations increased with 0.31 ΧN on average. Thin film simulations show no change in rate associated with the energy barrier below ΧN ∼ 50, and then show an increase in energy barrier scaling with 0.16ΧN. Thin film simulations always begin to heal at either the free interface or the BCP-underlayer interface where the increased A-B contact area associated with the transition state will be minimized, while the infinitely thick films must start healing in the bulk where the A-B contact area is increased. It is also found that cooperative chain movement is required for the defect to start healing.
Original language | English (US) |
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Title of host publication | Alternative Lithographic Technologies VII |
Editors | Christopher Bencher, Douglas J. Resnick |
Publisher | SPIE |
ISBN (Electronic) | 9781628415254 |
DOIs | |
State | Published - 2015 |
Event | Alternative Lithographic Technologies VII - San Jose, United States Duration: Feb 23 2015 → Feb 26 2015 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
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Volume | 9423 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Other
Other | Alternative Lithographic Technologies VII |
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Country/Territory | United States |
City | San Jose |
Period | 2/23/15 → 2/26/15 |
Bibliographical note
Publisher Copyright:© 2015 SPIE.
Keywords
- Block co-polymer
- DSA
- Directed self-assembly
- Dissipative particle dynamics simulation
- Hole multiplication
- Hole shrink
- Placement error