Modeling electrostatic and quantum detection of molecules

Smitha Vasudevan, Kamil Walczak, Neeti Kapur, Matt Neurock, Avik W. Ghosh

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We describe two different modes for electronically detecting an adsorbed molecule using a nanoscale transistor. The attachment of an ionic molecular target shifts the threshold voltage through modulation of the depletion layer electrostatics. A stronger bonding between the molecule and the channel, involving actual overlap of their quantum mechanical wavefunctions, leads to scattering by the molecular traps that creates characteristic fingerprints when scanned with a backgate. We describe a theoretical approach to model these transport characteristics.

Original languageEnglish (US)
Article number4529224
Pages (from-to)857-862
Number of pages6
JournalIEEE Sensors Journal
Volume8
Issue number6
DOIs
StatePublished - Jun 2008

Bibliographical note

Funding Information:
Manuscript received July 31, 2007; revised January 25, 2008 and February 12, 2008. This work was supported in part by DARPA-AFOSR, in part by NSF-NIRT, and in part by the NSF Career Award. The associate editor coordinating the review of this paper and approving it for publication was Prof. Robert Trew.

Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.

Keywords

  • Coulomb scattering
  • Field-effect transistor (FET)
  • Quantum interference
  • Random telegraph signal (RTS)
  • Time-dependent NEGF

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