Monolayer Transition Metal Dichalcogenide Channel-Based Tunnel Transistor
Open Access
- 26 November 2013
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of the Electron Devices Society
- Vol. 1 (10), 175-180
- https://doi.org/10.1109/jeds.2013.2292799
Abstract
We investigate the gate controlled direct band-to-band tunneling (BTBT) current in monolayer transition-metal dichalcogenide (MX2) channel-based tunnel field effect transistor (TFET). Five MX2 materials (MoS2,MoSe2,MoTe2,WS2,WSe2) in their 2-D sheet forms are considered for this purpose. We first study the real and imaginary band structure of those MX2 materials by density-functional theory (DFT), which is then used to evaluate the gate-controlled current under the Wentzel-Kramers-Brillouin (WKB) approximation. It is shown that all five MX2 support direct BTBT in their monolayer sheet forms and offer an average ON current and subthreshold slope of 150 μA/μm (at Vd=0.1 V) and 4 mV/dec, respectively. Furthermore, we also demonstrate the strain effect on the complex band structures and the performances of MX2 based TFETs. It is observed that a certain tensile strain becomes favorable for the improvement of ON-current performances.Keywords
This publication has 32 references indexed in Scilit:
- Tunnel field-effect transistors as energy-efficient electronic switchesNature, 2011
- How Good Can Monolayer MoS2 Transistors Be?Nano Letters, 2011
- Single-layer MoS2 transistorsNature Nanotechnology, 2011
- Emerging Photoluminescence in Monolayer MoS2Nano Letters, 2010
- Performance analysis of InP nanowire band-to-band tunneling field-effect transistorsApplied Physics Letters, 2009
- Drive current boosting of n-type tunnel FET with strained SiGe layer at sourceMicroelectronics Journal, 2008
- Band-to-Band Tunneling in Carbon Nanotube Field-Effect TransistorsPhysical Review Letters, 2004
- Scaling theory for double-gate SOI MOSFET'sIEEE Transactions on Electron Devices, 1993
- Optical properties of mixed transition metal dichalcogenide crystalsMaterials Letters, 1989
- Temperature dependence of the electrical conductivity and hall coefficient in 2H‐MoS2, MoSe2, WSe2, and MoTe2Physica Status Solidi (b), 1977