Influence of Cu metal on the domain structure and carrier mobility in single-layer graphene |
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Authors: | Carlo M. Orofeo Hiroki Hibino Kenji Kawahara Yui Ogawa Masaharu Tsuji Ken-ichi Ikeda Seigi Mizuno Hiroki Ago |
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Affiliation: | 1. Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan;2. NTT Basic Research Laboratories, Kanagawa 243-0198, Japan;3. Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 816-8580, Japan |
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Abstract: | We demonstrate that domain structure of single-layer graphene grown by ambient pressure chemical vapor deposition is strongly dependent on the crystallinity of the Cu catalyst. Low energy electron microscopy analysis reveals that graphene grown using a Cu foil gives small and mis-oriented graphene domains with a number of domain boundaries. On the other hand, no apparent domain boundaries are observed in graphene grown over a heteroepitaxial Cu(111) film deposited on sapphire due to unified orientation of graphene hexagons. The difference in the domain structures is correlated with the difference in the crystal plane and grain structure of the Cu metal. The graphene film grown on the heteroepitaxial Cu film exhibits much higher carrier mobility than that grown on the Cu foil. |
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