Journal
NANO LETTERS
Volume 22, Issue 4, Pages 1518-1524Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c04139
Keywords
graphene; hexagonal boron nitride; twisted graphene; van der Waals heterostructures; layer-by-layer assembly; two dimensional materials; tunnel device
Categories
Funding
- Basic Science Research Program [2020R1C1C1014590]
- Basic Research Laboratory Program [2020R1A4A1019455]
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT) [2018M3D1A1058793, 2020M3D1A1110548]
- NSF-MRSEC [DMR-1720633]
- NRF - Ministry of Science and ICT [2020R1A2B5B02001876, 2018R1A56075964]
- National Research Foundation of Korea [2020R1A2B5B02001876] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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By utilizing van der Waals interactions, we have successfully achieved programmed crystal assembly of graphene and monolayer hexagonal boron nitride, resulting in wafer-scale films with near-perfect interfaces and high yield. Through controlling the thickness of the hexagonal boron nitride barrier, the multilayer structure and electronic band structure of graphene, we have demonstrated tunable electronic device arrays.
Crystalline films offer various physical properties based on the modulation of their thicknesses and atomic structures. The layer-bylayer assembly of atomically thin crystals provides a powerful means to arbitrarily design films at the atomic level, which are unattainable with existing growth technologies. However, atomically clean assembly of the materials with high scalability and reproducibility remains challenging. We report programmed crystal assembly of graphene and monolayer hexagonal boron nitride, assisted by van der Waals interactions, to form wafer-scale films of pristine interfaces with near-unity yield. The atomic configurations of the films are tailored with layer-resolved compositions and in-plane crystalline orientations. We demonstrate batch-fabricated tunnel device arrays with modulation of the resistance over orders of magnitude by thickness control of the hexagonal boron nitride barrier with single-atom precision and large-scale, twisted multilayer graphene with programmable electronic band structures and crystal symmetries. Our results constitute an important development in the artificial design of large- scale films.
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