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Direct growth of high-quality Al2O3 dielectric on graphene layers by low-temperature H2O-based ALD
- Source :
- Journal of Physics D: Applied Physics. 47:055106
- Publication Year :
- 2014
- Publisher :
- IOP Publishing, 2014.
-
Abstract
- A thin Al2O3 dielectric film was directly grown onto graphene layers without any surface treatment prior to H2O-based atomic layer deposition for the first time. The growth mechanism of Al2O3 dielectric film has been studied by changing the growth temperature and purge time. We found that the film morphology was influenced by the amount and distribution of physically adsorbed precursor molecules on the graphene, especially by physically adsorbed H2O molecules. Within an optimal temperature window, conformal and uniform Al2O3 thin films were obtained as confirmed by atomic force microscopy and transmission electron microscopy results. Raman spectroscopy revealed that no extra defects are generated in the graphene layers. Furthermore, the low leakage current and interface traps in dual-gated graphene field-effect transistors demonstrate the high-quality dielectric/graphene stack.
- Subjects :
- Materials science
Acoustics and Ultrasonics
business.industry
Graphene
Graphene foam
Nanotechnology
Dielectric
Condensed Matter Physics
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
Atomic layer deposition
law
Optoelectronics
Thin film
business
Bilayer graphene
Graphene nanoribbons
Graphene oxide paper
Subjects
Details
- ISSN :
- 13616463 and 00223727
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- Journal of Physics D: Applied Physics
- Accession number :
- edsair.doi...........394b68e4e412cdbef5a41902faea78de