M. Ramón, A. Gupta, C. Corbet, D. Ferrer, H. Movva, G. Carpenter, L. Colombo, G. Bourianoff, M. Doczy, D. Akinwande, E. Tutuc, S. Banerjee
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Graphene field-effect transistors using large-area monolayer graphene grown by chemical vapor deposition on Co thin films
There has been great interest in methods for the synthesis of high-quality, large-area graphene films, as required for practical applications in the electronics industry. In particular, recent developments in chemical vapor deposition (CVD) methods have shown a promising approach to grow large-area graphene on metal substrates by catalyzed CVD growth [1]. Reports of CVD growth on Cu and Ni are common [1–3]; however, there have been few efforts to grow graphene on Co [4], and attempts to grow graphene on Co/SiO2/Si resulted in very small domains of predominantly multilayer graphene that were not suitable for transistor fabrication. Unlike Ni, Co is attractive due to the low lattice mismatch (< 2%) between graphene and the Co (0001) surface, and Co exhibits greater compatibility with Si than Cu, which is a deep trap in Si and a fast diffuser. Here we have demonstrated graphene field-effect transistors (GFETs) fabricated using large-area monolayer graphene grown by catalyzed CVD on Co films.