Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.126601
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Funding
- NSF CAREER [DMR-0748604]
- NSF NIRT [ECS-0609243]
- NNIN [REU-0335765]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [748604] Funding Source: National Science Foundation
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We demonstrate atomic layer deposition of high-quality dielectric HfO2 films on graphene and determine the magnitude of remote oxide surface phonon scattering in dual-oxide structures. The carrier mobility in these HfO2-covered graphene samples reaches 20000 cm(2)/Vs at low temperature. Distinct contributions to the resistivity from surface optical phonons in the SiO2 substrate and the HfO2 overlayer are isolated. At 300 K, surface phonon modes of the HfO2 film centered at 54 meV limit the mobility to approximately 20000 cm(2)/Vs.
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