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RESEARCH PRODUCT
High-Mobility, Wet-Transferred Graphene Grown by Chemical Vapor Deposition
Takashi TaniguchiTymofiy KhodkovDomenico De FazioStijn GoossensDavid G. PurdieFrank H. L. KoppensIlya GoykhmanPhilipp Braeuninger-weimerPatrizia LivreriAntonio LombardoStephan HofmannKenji WatanabeA. K. OttAndrea C. Ferrarisubject
Materials scienceFOS: Physical sciencesGeneral Physics and AstronomyHexagonal boron nitride02 engineering and technologyChemical vapor deposition010402 general chemistrySettore ING-INF/01 - Elettronica01 natural scienceslaw.inventionlawMesoscale and Nanoscale Physics (cond-mat.mes-hall)General Materials ScienceDry transferCondensed Matter - Materials ScienceCondensed Matter - Mesoscale and Nanoscale PhysicsCharge carrier mobilityGrapheneSettore FIS/01 - Fisica Sperimentalecharge carrier mobilitygrapheneGeneral EngineeringMaterials Science (cond-mat.mtrl-sci)HeterojunctionheterostructureCVD021001 nanoscience & nanotechnologyCombined approach0104 chemical sciencesheterostructuresChemical engineeringCrystallitecharge carrier mobility; CVD; graphene; heterostructures; transfer;0210 nano-technologytransferdescription
We report high room-temperature mobility in single layer graphene grown by Chemical Vapor Deposition (CVD) after wet transfer on SiO$_2$ and hexagonal boron nitride (hBN) encapsulation. By removing contaminations trapped at the interfaces between single-crystal graphene and hBN, we achieve mobilities up to$\sim70000cm^2 V^{-1} s^{-1}$ at room temperature and$\sim120000cm^2 V^{-1} s^{-1}$ at 9K. These are over twice those of previous wet transferred graphene and comparable to samples prepared by dry transfer. We also investigate the combined approach of thermal annealing and encapsulation in polycrystalline graphene, achieving room temperature mobilities$\sim30000 cm^2 V^{-1} s^{-1}$. These results show that, with appropriate encapsulation and cleaning, room temperature mobilities well above $10000cm^2 V^{-1} s^{-1}$ can be obtained in samples grown by CVD and transferred using a conventional, easily scalable PMMA-based wet approach.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-01 | ACS Nano |