journal article·2016-03-03

Two-Dimensional γ-Graphyne Suspended on Si(111): A Hybrid Device

Aldilene Saraiva-Souza, Manuel Smeu, Lei Zhang, Mark A. Ratner, Hong Guo

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Abstract

Graphynes (GYs) are a new class of two-dimensional (2D) carbon allotrope materials that are similar to graphene but with C 2 units inserted into certain bonds to produce physical properties distinct from those of graphene. In this work, atomic, electronic, and quantum transport properties of γ-GY—a particular type of graphyne—absorbed on the silicon (111) surface are investigated from atomistic first principles. γ-GY possesses an intrinsic direct band gap, and when interacting with the Si(111), interesting subgap electronic structure is induced to mediate charge transport. In particular, the transmission spectra of the γ-GY/Si(111) hybrid device have a high broad peak at the Fermi level due to hybridization. For γ-GY/Si(111) transport junctions having a finite length trench underneath the γ-GY, substantial charge conduction can still occur through the γ-GY bridge. Nonequilibrium calculations suggest that the hybrid 2D γ-GY/Si(111) transport junction is highly controllable by external voltages.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Graphene research and applications · Molecular Junctions and Nanostructures · Advancements in Battery Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for the Physics of Materials and Department of Physics, McGill University, Montreal, QC H3A 0G4, Canada

Departamento de Física, Universidade Federal do Piauí, Teresina, PI 64049-550, Brazil

Department of Physics, Binghamton University - State University of New York, Binghamton, New York 13902, United States

State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China

Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States

Funding

Division of Chemistry · Fonds de Recherche du Québec - Nature et Technologies · Conselho Nacional de Desenvolvimento Científico e Tecnológico · Natural Sciences and Engineering Research Council of Canada

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