Nonlinear pH sensitivity of molecular modified transistors

Hila Einati*, Roman Novitski, Yosi Shacham-Diamand

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The integration of organic self-assembled monolayers (SAMs) in electronic devices is very attractive since they offer high flexibility in design and applications. This paper models the operation of functionalized field effect transistor with a liquid gate. The model explains the nonlinear response to pH variations in SAM-field effect devices. The organic monolayers have low density of sites in comparison to inorganic layers; furthermore, the transistor sensitivity to pH is low and dramatically influenced by the Helmholtz capacitance. It was proven that the dissociation constants have a strong effect on the characteristics of organic field effect device.

Original languageEnglish
Article number013505
JournalApplied Physics Letters
Issue number1
StatePublished - 5 Jul 2010


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