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The epitaxial growth of functional oxides using a substrate with a graphene layer is a highly desirable method for improving structural quality and obtaining freestanding epitaxial nanomembranes for scientific study, applications, and economical reuse of substrates. However, the aggressive oxidizing conditions typically used in growing epitaxial oxides can damage graphene. Here, we demonstrate the successful use of hybrid molecular beam epitaxy for SrTiO3 growth that does not require an independent oxygen source, thus avoiding graphene damage. This approach produces epitaxial films with self-regulating cation stoichiometry. Furthermore, the film (46-nm-thick SrTiO3) can be exfoliated and transferred to foreign substrates. These results open the door to future studies of previously unattainable freestanding oxide nanomembranes grown in an adsorption-controlled manner by hybrid molecular beam epitaxy. This approach has potentially important implications for the commercial application of perovskite oxides in flexible electronics and as a dielectric in van der Waals thin-film electronics.
Bibliographical noteFunding Information:
We thank J. Kim for discussion. Funding: Hybrid MBE growth and characterization of SrTiO3 films were supported by the U.S. Department of Energy (DOE) through grant DE-SC0020211. Graphene growth and integration with the oxide substrate was supported by the Air Force Office of Scientific Research through grants FA9550-21-0460 and FA9550-21-1-0025. Film growth was performed using instrumentation funded by DURIP award FA9550-18-1-0294. Preliminary graphene growth and sample preparation at the University of Wisconsin was supported by the DOE, Office of Science, Basic Energy Sciences, under award no. DE-SC0016007, and the NSF through grant DMR-1752797. Parts of this work were carried out at the Characterization Facility, University of Minnesota, which receives partial support from the NSF through the MRSEC program under award DMR-2011401. Substrate preparation was carried out at the Minnesota Nano Center, which is supported by the NSF through the National Nano Coordinated Infrastructure under award ECCS-2025124. STEM and XPS were supported by the DOE, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under award no. 10122. Pacific Northwest National Laboratory (PNNL) is a multiprogram national laboratory operated by Battelle for the DOE under contract DE-AC05-79RL01830. We acknowledge facility support from the Environmental Molecular Sciences Laboratory, a DOE Office of Science User Facility sponsored by the Biological and Environmental Research program and located at PNNL. A portion of the microscopy work was performed in the Radiological Microscopy Suite (RMS), located in the Radiochemical Processing Laboratory (RPL) at PNNL.
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PubMed: MeSH publication types
- Journal Article
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- 2 Active
9/1/20 → 8/31/26
Project: Research project