University of Tabriz Tabriz Journal of Electrical Engineering 2008-7799 49 4 2020 02 01 Reducing Ambipolar Current in Germanene Nanoribbon Tunneling Field Effect Transistor (GeNR-TFET) using Gate-Drain Overlap and Decreasing Doping Density in the Drain Side Reducing Ambipolar Current in Germanene Nanoribbon Tunneling Field Effect Transistor (GeNR-TFET) using Gate-Drain Overlap and Decreasing Doping Density in the Drain Side 1527 1532 10000 FA A. H. Bayani Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, Iran D. Dideban Department of Electrical and Computer Engineering, University of Kashan, Kashan, Iran N. Moezi Technical and Vocational University, Kashan, Iran Journal Article 2017 09 12 In this research, we investigate the ambipolar current in germanene nanoribbon tunneling field effect transistor (GeNR-TFET) using combination of density functional theory (DFT) and non-equilibrium Green’s function method (NEGF). We propose two different methods to reduce the ambipolar current in the GeNR-TFET: using overlapped gate metal to cover part of the drain side and the other idea is to decrease the doping density in the drain side. The results show that by extension of the metal gate on the drain region, the hole current from the drain to channel reduces and it is possible to reduce this current more by using longer overlapping length. Also, results prove that by decreasing the doping density in the drain side compared with the source region, the ambipolar current declines. We obtain that by mixing two proposed ways, the ambipolar current can significantly be reduced. Suppression of this ambipolar current is an important challenge in digital circuit design. In this research, we investigate the ambipolar current in germanene nanoribbon tunneling field effect transistor (GeNR-TFET) using combination of density functional theory (DFT) and non-equilibrium Green’s function method (NEGF). We propose two different methods to reduce the ambipolar current in the GeNR-TFET: using overlapped gate metal to cover part of the drain side and the other idea is to decrease the doping density in the drain side. The results show that by extension of the metal gate on the drain region, the hole current from the drain to channel reduces and it is possible to reduce this current more by using longer overlapping length. Also, results prove that by decreasing the doping density in the drain side compared with the source region, the ambipolar current declines. We obtain that by mixing two proposed ways, the ambipolar current can significantly be reduced. Suppression of this ambipolar current is an important challenge in digital circuit design. https://tjee.tabrizu.ac.ir/article_10000_1fba3b1d16fa7288f13bf5e232b71d83.pdf