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A novel graphene nanoribbon field effect transistor with two different gate insulators

Akbari Eshkalak, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.physe.2014.10.021
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. In this paper, a novel structure for a dual-gated graphene nanoribbon field-effect transistor (GNRFET) is offered, which combines the advantages of high and low dielectric constants. In the proposed Two Different Insulators GNRFET (TDI-GNRFET), the gate dielectric at the drain side is a material with low dielectric constant to form smaller capacitances, while in the source side, there is a material with high dielectric constant to improve On-current and reduce the leakage current. Simulations are performed based on self-consistent solutions of the Poisson equation coupled with Non-Equilibrium Green's Function (NEGF) formalism in the ballistic regime. We assume a tight-binding Hamiltonian in the mode space representation. The results demonstrate that TDI-GNRFET has lower Off-current, higher On-current and higher transconductance in comparison with conventional low-K GNRFET. Furthermore, using a top-of-the-barrier two-dimensional circuit model, some important circuit parameters are studied. It is found that TDI-GNRFET has smaller capacitances, lower intrinsic delay time and shorter power delay product (PDP) in comparison with high-K GNRFET. Moreover, mobile charge and average velocity are improved in comparison with low dielectric constant GNRFET. The results show that the TDI-GNRFET can provide Drain Induced Barrier Lowering (DIBL) and Subthreshold Swing near their theoretical limits
  6. Keywords:
  7. Non-Equilibrium Green's Function (NEGF) ; Two-dimensional FET Model ; Fet modeling ; Gate insulator ; Graphene nano-ribbon ; Non-equilibrium Green's function ; Tight binding ; Two Different Insulators GNRFET (TDI-GNRFET)
  8. Source: Physica E: Low-Dimensional Systems and Nanostructures ; Volume 66 , 2015 , Pages 133-139 ; 13869477 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1386947714003646