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|Title:||Large scale graphene/hexagonal boron nitride heterostructure for tunable plasmonics|
hexagonal boron nitride
plasma chemical vapor deposition
|Source:||Zhang, K., Yap, F.L., Li, K., Ng, C.T., Li, L.J., Loh, K.P. (2014-02-12). Large scale graphene/hexagonal boron nitride heterostructure for tunable plasmonics. Advanced Functional Materials 24 (6) : 731-738. ScholarBank@NUS Repository. https://doi.org/10.1002/adfm.201302009|
|Abstract:||Vertical integration of hexagonal boron nitride (h-BN) and graphene for the fabrication of vertical field-effect transistors or tunneling diodes has stimulated intense interest recently due to the enhanced performance offered by combining an ultrathin dielectric with a semi-metallic system. Wafer scale fabrication and processing of these heterostructures is needed to make large scale integrated circuitry. In this work, by using remote discharged, radio-frequency plasma chemical vapor deposition, wafer scale, high quality few layer h-BN films are successfully grown. By using few layer h-BN films as top gate dielectric material, the plasmon energy of graphene can be tuned by electrostatic doping. An array of graphene/h-BN vertically stacked micrometer-sized disks is fabricated by lithography and transfer techniques, and infrared spectroscopy is used to observe the modes of tunable graphene plasmonic absorption as a function of the repeating (G/h-BN)n units in the vertical stack. Interestingly, the plasmonic resonances can be tuned to higher frequencies with increasing layer thickness of the disks, showing that such vertical stacking provides a viable strategy to provide wide window tuning of the plasmons beyond the limitation of the monolayer. An array of graphene/h-BN vertically stacked micrometer-sized disks is fabricated by lithography and transfer techniques, and infrared spectroscopy is used to observe the modes of tunable graphene plasmonic absorption as a function of the repeating (G/h-BN)n units in the vertical stack. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.|
|Source Title:||Advanced Functional Materials|
|Appears in Collections:||Staff Publications|
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