Electronic transport of recrystallized freestanding graphene nanoribbons

ACS Nano
Zhengqing John QiA T Charlie Johnson

Abstract

The use of graphene and other two-dimensional materials in next-generation electronics is hampered by the significant damage caused by conventional lithographic processing techniques employed in device fabrication. To reduce the density of defects and increase mobility, Joule heating is often used since it facilitates lattice reconstruction and promotes self-repair. Despite its importance, an atomistic understanding of the structural and electronic enhancements in graphene devices enabled by current annealing is still lacking. To provide a deeper understanding of these mechanisms, atomic recrystallization and electronic transport in graphene nanoribbon (GNR) devices are investigated using a combination of experimental and theoretical methods. GNR devices with widths below 10 nm are defined and electrically measured in situ within the sample chamber of an aberration-corrected transmission electron microscope. Immediately after patterning, we observe few-layer polycrystalline GNRs with irregular sp(2)-bonded edges. Continued structural recrystallization toward a sharp, faceted edge is promoted by increasing application of Joule heat. Monte Carlo-based annealing simulations reveal that this is a result of concentrated local curren...Continue Reading

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Feb 4, 2016·Nature Nanotechnology·Stephanie J Heerema, Cees Dekker
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Dec 10, 2016·ACS Applied Materials & Interfaces·Ye FanJamie H Warner
May 8, 2020·ACS Nano·Paul Masih Das, Marija Drndić

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