Modeling electrostatic and quantum detection of molecules

Details Modeling electrostatic and quantum detection of molecules Modeling electrostatic and quantum detection of molecules

2008-08-18

arxiv.org/abs/0808.2262v1

Vasudevan, S.; Walczak, K.; Kapur, N.; Neurock, M.; Ghosh, A.W., "Modeling Electrostatic and Quantum Detection of Molecules,"

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 5 figures

Scientific paper

10.1109/JSEN.2008.923264

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.

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