Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-07-10
Nature Materials 9, 806 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
accepted in Nature Materials
Scientific paper
10.1038/nmat2830
Most materials in available macroscopic quantities are polycrystalline. Graphene, a recently discovered two-dimensional form of carbon with strong potential for replacing silicon in future electronics, is no exception. There is growing evidence of the polycrystalline nature of graphene samples obtained using various techniques. Grain boundaries, intrinsic topological defects of polycrystalline materials, are expected to dramatically alter the electronic transport in graphene. Here, we develop a theory of charge carrier transmission through grain boundaries composed of a periodic array of dislocations in graphene based on the momentum conservation principle. Depending on the grain boundary structure we find two distinct transport behaviours - either high transparency, or perfect reflection of charge carriers over remarkably large energy ranges. First-principles quantum transport calculations are used to verify and further investigate this striking behaviour. Our study sheds light on the transport properties of large-area graphene samples. Furthermore, purposeful engineering of periodic grain boundaries with tunable transport gaps would allow for controlling charge currents without the need of introducing bulk band gaps in otherwise semimetallic graphene. The proposed approach can be regarded as a means towards building practical graphene electronics.
Louie Steven G.
Yazyev Oleg V.
No associations
LandOfFree
Electronic transport in polycrystalline graphene does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Electronic transport in polycrystalline graphene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic transport in polycrystalline graphene will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-300271