Molecular control of the drain current in a buried channel MOSFET

G. M. Laws, Trevor Thornton, Jinman Yang, L. De La Garza, Michael Kozicki, D. Gust

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have developed a hybrid molecular/MOSFET, which is sensitive to the presence of a molecular layer attached to its surface. The application of the molecular layer was investigated by observing changes in the drain current as a function of substrate voltage pre- and post molecular treatment. A significant shift in the threshold current of the device was observed after application of the molecules. The threshold shift can be attributed to an increase in the electron charge density in the MOSFET channel, resulting from an increase in the positive fixed charge at the native oxide surface. A numerical simulation supports this conclusion. It is speculated that the molecules protonate the surface of the SiO2 due to the higher acidity of the molecular groups compared to that of the native oxide. To assess the validity of this hypothesis a series of molecules with similar structure but with different acidities (pKa values) were investigated, to correlate the shift in threshold voltage with the difference in pKa value between the applied chemical and the SiO2 surface (pKa = 6.8). Preliminary results showing the systematic variation of ΔVth and pKa are presented.

Original languageEnglish (US)
Pages (from-to)83-89
Number of pages7
JournalPhysica Status Solidi (B) Basic Research
Volume233
Issue number1
DOIs
StatePublished - Sep 2002

Fingerprint

Drain current
field effect transistors
Acidity
acidity
Oxides
Molecules
molecules
oxides
shift
Charge density
Threshold voltage
threshold currents
threshold voltage
thresholds
Electrons
Computer simulation
Electric potential
electric potential
Substrates
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Molecular control of the drain current in a buried channel MOSFET. / Laws, G. M.; Thornton, Trevor; Yang, Jinman; De La Garza, L.; Kozicki, Michael; Gust, D.

In: Physica Status Solidi (B) Basic Research, Vol. 233, No. 1, 09.2002, p. 83-89.

Research output: Contribution to journalArticle

Laws, G. M. ; Thornton, Trevor ; Yang, Jinman ; De La Garza, L. ; Kozicki, Michael ; Gust, D. / Molecular control of the drain current in a buried channel MOSFET. In: Physica Status Solidi (B) Basic Research. 2002 ; Vol. 233, No. 1. pp. 83-89.
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