Browsing by Author "Kamel, H"

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    Investigation of gate leakage current in TFET: A semi-numerical approach
    (Alexandria University, 2023-04) Tawfik, N.M.S; Shaker, A; Sayed, I; Kamel, H; Salem, M.S; Dessouky, M; Fedawy, M
    Tunneling FET (TFET) has been demonstrated as a favorable candidate to replace con- ventional MOSFETs in low-power applications. However, there are many challenges that should be overcome to efficiently operate the TFET. One of the most limiting factors that can restrict the TFET performance is the gate leakage current. In this paper, the tunneling leakage current through the gate oxide of double gate TFET has been analyzed. The conduction band energy level for gate- oxide-silicon was employed to calculate the tunneling transmission coefficient by utilizing a numer- ical method. To obtain the potential barrier between the gate and the channel surface, a modified analytical pseudo-2D method has been applied to deduce the corresponding surface potential taking into account a precise calculation of depletion regions. Furthermore, the inclusion of the image charge barrier lowering effect is incorporated in calculating the transmission probability through the oxide. Including such an effect shows a significant influence on determining the gate tunneling current. The gate leakage current has been calculated for various bias voltages and equivalent oxide thicknesses. The presented semi-numerical technique shows good agreement within a suitable CPU time when validated and compared against full numerical TCAD simulation. 2023 The Authors. Published by Elsevier B.V. on behalf of Faculty of Engineering, Alexandria University
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    A modified pseudo 2D physically-based model for double-gate TFETs: Role of precise calculations of drain and source depletion regions
    (Elsevier, 7/14/2021) Yahia, Yasmin; Salem, Marwa S; Shaker, A; Kamel, H; Abouelatta, M; ElBanna, M
    In this current study, a modified pseudo two-dimensional (2-D) semi-analytical model for double gate tunnel FETs (DG-TFETs) is introduced. The main regions in the DG-TFET structure are the channel and the depletion regions inside the source and the drain. In such regions, the 2-D Poisson’s equation is solved by adjusting suitable boundary conditions. The source and the drain depletion region lengths are calcu- lated precisely by an iterative technique resulting in an accurate prediction of the electrostatic potential. According to the obtained 2-D electrostatic potential, the energy band diagram could be extracted and, consequently, the minimum tunneling width is calculated. Accordingly, the model of drain current is introduced by applying Kane’s tunneling model. Further, the source depletion charge and the channel charge are derived, and the terminal capacitance components are then extracted. A comparison between the proposed model and SILVACO TCAD simulations shows a satisfactory agreement that confirms the validation of the presented model robustness. 2021 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Ain Shams Uni- versity. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/ by-nc-nd/4.0/).