Friday morning October 31, nanoHUB tools and home directories will be unavailable from 6 AM to noon (eastern time); we're getting a new file server! All tool sessions will be lost. Also, the web site will be unavailable for about 15 minutes sometime between 8-9 AM. close

Support

Support Options

Submit a Support Ticket

 

Threshold voltage in a nanowire MOSFET

By Saumitra Raj Mehrotra1, SungGeun Kim1, Gerhard Klimeck1

1. Purdue University

Category

Animations

Published on

Abstract

Threshold voltage in a metal oxide semiconductor field-effect transistor (better known as a MOSFET) is usually defined as the gate voltage at which an inversion layer forms at the interface between the insulating layer (oxide) and the substrate (body) of the transistor. A MOSFET is said to be turned ON or be in the ON state beyond the threshold voltage.

Threshold voltage in a metal oxide semiconductor field-effect transistor (MOSFET)

With the scaling of MOSFET channel lengths, researchers are looking at new transistor designs. Among them is the gate-all-around nanowire MOSFET. Due to quantum mechanical confinement in both the transverse directions, an inversion channel is formed at the center of the device. This phenomenon is called volume inversion. Threshold voltage for the simulated nanowire device in the accompanying image is ~0.45V.

For a basic understanding of the threshold voltage in MOSFET in general, refer to
* introductory presentation : ECE 612 Lecture 13: Threshold Voltage and MOSFET Capacitances presented by M. Lundstrom
* several methods of extracting a threshold voltage: Dieter K. Schroder's book "Semiconductor material and device characterization", pp 222-230

Further reading material can be found in the following papers

* Hamdy Abd El Hamid; Benjamin Iniguez; Jaume Roig Guitart; , "Analytical Model of the Threshold Voltage and Subthreshold Swing of Undoped Cylindrical Gate-All-Around-Based MOSFETs," Electron Devices, IEEE Transactions on , vol.54, no.3, pp.572-579, March 2007
* Ray, B.; Mahapatra, S.; , "Modeling and Analysis of Body Potential of Cylindrical Gate-All-Around Nanowire Transistor," Electron Devices, IEEE Transactions on , vol.55, no.9, pp.2409-2416, Sept. 2008

Credits

Image rendered with nanoHUB tool OMENwire (http://nanohub.org/resources/omenwire).

Cite this work

Researchers should cite this work as follows:

  • Saumitra Raj Mehrotra; SungGeun Kim; Gerhard Klimeck (2010), "Threshold voltage in a nanowire MOSFET," http://nanohub.org/resources/8803.

    BibTex | EndNote

Tags

nanoHUB.org, a resource for nanoscience and nanotechnology, is supported by the National Science Foundation and other funding agencies. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.