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- W2587611141 abstract "The possible origins of metal-bilayer graphene (BLG) contact resistance are investigated by taking into consideration the bandgap formed by interfacial charge transfer at the metal contacts. Our results show that a charge injection barrier (Schottky barrier) does not contribute to the contact resistance because the BLG under the contacts is always degenerately doped. We also showed that the contact-doping-induced increase in the density of states (DOS) of BLG under the metal contacts decreases the contact resistance owing to enhanced charge carrier tunnelling at the contacts. The contact doping can be enhanced by inserting molecular dopant layers into the metal contacts. However, carrier tunnelling through the insertion layer increases the contact resistance, and thus, alternative device structures should be employed. Finally, we showed that the inter-band transport by variable range hopping via in-gap states is the largest contributor to contact resistance when the carrier type of the gated channel is opposite to the contact doping carrier type. This indicates that the strategy of contact resistance reduction by the contact-doping-induced increase in the DOS is effective only for a single channel transport branch (n- or p-type) depending on the contact doping carrier type." @default.
- W2587611141 created "2017-02-17" @default.
- W2587611141 creator A5019532008 @default.
- W2587611141 date "2017-03-01" @default.
- W2587611141 modified "2023-09-29" @default.
- W2587611141 title "Contact resistance at planar metal contacts on bilayer graphene and effects of molecular insertion layers" @default.
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- W2587611141 doi "https://doi.org/10.1088/1361-6528/aa5ec2" @default.
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- W2587611141 hasPublicationYear "2017" @default.
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