Analysis on Non-Ideal Nonlinear Characteristics of Graphene-Based Three-Branch Nano-Junction Device

Xiang YIN  Masaki SATO  Seiya KASAI  

IEICE TRANSACTIONS on Electronics   Vol.E98-C   No.5   pp.434-438
Publication Date: 2015/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.434
Type of Manuscript: Special Section PAPER (Special Section on Fundamentals and Applications of Advanced Semiconductor Devices)
graphene,  TBJ,  nonlinear characteristic,  contact resistance,  graphene-metal contact,  

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We investigate the origin of non-ideal transfer characteristics in graphene-based three-branch nano-junction (TBJ) devices. Fabricated graphene TBJs often show asymmetric nonlinear voltage transfer characteristic, although symmetric one should appear ideally. A simple model considering the contact resistances in two input electrodes is deduced and it suggests that the non-ideal characteristic arises from inequality of the metal-graphene contact resistances in the inputs. We fabricate a graphene TBJ device with electrically equal contacts by optimizing the contact formation process and almost ideal nonlinear characteristic was successfully demonstrated.