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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport
  • electron correlation, dynamical mean field theory
  • 2D materials, metal complexes

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Grain Boundary Effect on Electrical Transport Properties of Graphene

Cited 10 times inthomson ciCited 9 times inthomson ci
Title
Grain Boundary Effect on Electrical Transport Properties of Graphene
Author
Zhang, HLee, GeunsikGong, CColombo, LCho, K
Issue Date
2014-01
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.118, no.5, pp.2338 - 2343
Abstract
The presence of grain boundary affects the mechanical strength, thermal dissipation, and charge transport of polycrystalline graphene flakes. There is still a debate on whether the electronic transmission is severely degraded by the grain boundary, especially between simulations and experiments. To address this issue, we performed electrical transport simulations based on pi-orbital tight-binding Hamiltonian. Our results show that the intrinsic grain boundary is almost transparent for the carrier transport, but extrinsic chemical species (e.g., oxygen, hydroxyl) favor the adsorption on interdomain sites and increase the scattering substantially at the boundary region. The experiment, which shows degraded carrier transport due to grain boundary, can be plausibly explained with our theoretical results. To minimize the extrinsic effects of grain boundaries, we suggest doing electrical measurements under ultrahigh-vacuum condition after thermal annealing or applying pulsed current for desorbing the adsobates.
URI
https://scholarworks.unist.ac.kr/handle/201301/13128
URL
http://pubs.acs.org/doi/abs/10.1021/jp411464w
DOI
10.1021/jp411464w
ISSN
1932-7447
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CHM_Journal Papers
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