Publication Date

1-1-2020

Document Type

Article

Department

Electrical Engineering

Publication Title

IEEE Journal of the Electron Devices Society

Volume

8

DOI

10.1109/JEDS.2020.2981251

First Page

662

Last Page

667

Abstract

We postulate that in ultra-scaled Field Effect Transistors (FET), such as nanowires in sub-7nm technology, the source contact will act as an energy filter and increase the effective temperature of carriers arriving at the channel barrier. This is due to the absence of inelastic scattering in the short source-contact-to-channel region. As a result, the Sub-threshold Slope (SS) will increase substantially. In this paper, we verify this energy filtering effect through numerical calculations and Technology Computer-Aided-Design (TCAD) simulations calibrated to quantum solvers for electrostatics. It is found that SS degradation increases as the source metal workfunction increases. At 300K, in the nanowire simulated, SS increases from 94mV/dec to 109mV/dec for gate length, LG, = 10 nm and from 72mV/dec to 88mV/dec for LG= 15 nm, representing an increase of effective carrier temperature from 300K to more than 340K. The simulation result is also verified by including the Schroedinger equation (SE) for tunneling in TCAD simulation. It is also found that such an effect is worse at higher device temperature and disappears at cryogenic temperature.

Keywords

ballistic transport, energy filter, nanowire, Schottky contact, Sub-threshold slope

Comments

This is the Version of Record and can also be read online here.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

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