Robustness of Cu/Gr multilayer interconnects for the application of flexible electronics and the roles of graphene = 유연 소자에 쓰이는 배선으로서 구리/그래핀 멀티레이어의 견고성과 그래핀의 역할

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Cu/Gr multilayer composite with potential application as an interconnect material is a very promising material system. Nanoscale metal/graphene nanolayered composite is known to have ultra-high strength as the graphene effectively blocks dislocations from penetrating through the metal/graphene interface. The same graphene interface, which has a strong sp2 bonding, can simultaneously serve as an effective interface for deflecting the fatigue cracks that are generated under cyclic bending cycles. In this dissertation, Cu/Gr composite with repeat layer spacing of 100 nm was tested for bending fatigue at 1.6\% and 3.1\% strain up to 1,000,000 cycles that showed for the first time a 5$\sim$6 times enhancement in fatigue resistance compared to the conventional Cu thin film. Fatigue cracks that are generated within the Cu layer were stopped by the graphene interface, which are evidenced by cross-sectional SEM and TEM images. Molecular dynamics simulations for uniaxial tension of Cu/Gr showed limited accumulation of dislocations at the film/substrate interface, which makes the fatigue crack formation and propagation through thickness of the film difficult in this materials system. In addition, much more efficient large scale fabrication of Cu/Gr composite using roll-based transfer of graphene and electrodeposition of copper is introduced. The nano-pillar compression tests are performed and compared with previous studies to confirm that such composite fabricated display similar strengthening effect.
Advisors
Han, Seung Minresearcher한승민researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2019.2,[ii, 42 p. :]

Keywords

Copper▼agraphene▼aflexible device▼amultilayer▼alarge scale; 구리▼a그래핀▼a유연 소자▼a멀티레이어▼a대면적화

URI
http://hdl.handle.net/10203/266525
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843275&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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