Proximity Engineering of the van der Waals Interaction in Multilayered Graphene
- 주제(키워드) proximity engineering , van der Waals interaction , multilayered graphene , contact resistance , electride
- 주제(기타) Nanoscience & Nanotechnology
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Kim, Sera; Park, Jongho; Dinh Loc Duong; Kim, Sung Wng; Yang, Heejun] Sungkyunkwan Univ, Dept Energy Sci, Suwon 16419, Gyeonggi Do, South Korea; [Kim, Sera; Park, Jongho; Dinh Loc Duong] IBS, Ctr Integrated Nanostruct Phys, Suwon 16419, Gyeonggi Do, South Korea; [Cho, Suyeon] Ewha Womans Univ, Div Chem Engn & Mat Sci, Seoul 03760, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2019
- URI http://www.dcollection.net/handler/ewha/000000172044
- 본문언어 영어
- Published As https://dx.doi.org/10.1021/acsami.9b16655
- PubMed https://pubmed.ncbi.nlm.nih.gov/31657203
초록/요약
The van der Waals (vdW) interaction in two-dimensional (2D)-layered materials affects key characteristics of electronic devices, such as the contact resistance, with a vertical heterostructure geometry. While various functionalizations to manipulate the properties of 2D materials have shown issues such as defect generation or have a limited spatial range for the methods, engineering the vdW interaction in nondestructive ways for device applications has not been tried or properly achieved yet. Here, we introduce the proximity engineering of the vdW interaction in multilayered graphene, which is observed as modified interlayer distances and deviated stacking orders by Raman spectroscopy. A 2D electride, [Ca2N](+)center dot e(-), possessing a low-work function of 2.6 eV, was used to trigger an avalanche of electrons over tens of graphene layers, exceeding the conventional spatial-range limit (similar to 1 nm) by screening with a carrier density of 10(14) cm(-2). Our proximity engineering reduces the vdW interaction in a nondestructive way and achieves a promising graphene-metal contact resistance of 500 Omega.mu m without using complicated edge contacts, which demonstrates a way to use moderately decoupled graphene layers for device applications.
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