Publications

Molecular beam epitaxy growth of SrO buffer layers on graphite and graphene for the integration of complex oxides

Ahmed, Adam S.; Wen, Hua; Ohta, Taisuke O.; Pinchuk, Igor V.; Zhu, Tiancong; Beechem, Thomas E.; Kawakami, Roland K.

We report the successful growth of high-quality SrO films on highly-ordered pyrolytic graphite (HOPG) and single-layer graphene by molecular beam epitaxy. The SrO layers have (001) orientation as confirmed by X-ray diffraction (XRD) while atomic force microscopy measurements show continuous pinhole-free films having rms surface roughness of <1.5 Å. Transport measurements of exfoliated graphene after SrO deposition show a strong dependence between the Dirac point and Sr oxidation. Subsequently, the SrO is leveraged as a buffer layer for more complex oxide integration via the demonstration of (001) oriented SrTiO3 grown atop a SrO/HOPG stack.