Theoretical Analysis and Experimental Optimization of Graphene/TMD Heterojunction Barristors

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We optimized the graphene/MoS2 and graphene/WSe2 heterojunction barristors in terms of on-/off-current densities and on/off-current ratio by inserting an APTES layer which suppresses the charge puddle effect. The on-/off-current densities and on/off-current ratio were improved by a factor of 2.1/15 and 32 in the graphene/MoS2 barristor and 10/25 and 230 in the graphene/WSe2 barristor, respectively. Particularly, we reported an unusual phenomenon that on-state current density increases as the measurement temperature decreases in the graphene/WSe2 barristor. Finally, based on temperature-dependent current-voltage measurements coupled with first-principle density functional theory (DFT) calculations, we confirmed that the main operating mechanisms of graphene/MoS2 and graphene/WSe2 barristors were thermionic emission and trap-assisted tunneling processes, respectively.
Publisher
The Electrochemical Society
Issue Date
2016-10
Language
English
Citation

ECS Transactions, v.75, no.13, pp.43 - 48

ISSN
1938-5862
DOI
10.1149/07513.0043ecst
URI
http://hdl.handle.net/10203/269842
Appears in Collection
EEW-Journal Papers(저널논문)
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