Abstract
Control of semiconductor interface state density with molecular passivation is essential for developing conduction- based biosensors. In this study, GaAs junction field effect transistors ( JFETs ) are fabricated and characterized before and after passivation of the GaAs surface with self- assembled mono- and multilayers. The JFETs functionalized with 1- octadecanethiol monolayers and two types of self- assembled organic nanodielectric ( SAND ) multilayers exhibit significantly different threshold voltage ( V-th ) and subthreshold slope ( S-sub ) characteristics versus the unpassivated devices and provide useful information on the quality of the passivation. Two- dimensional device simulations quantify the effective density of fixed surface charges and interfacial traps and argue for the importance of the type- III SAND ionic charges in enhancing GaAs JFET response characteristics.
Citation
APPLIED PHYSICS LETTERS 92, 123509
Date of this Version
March 2008
Recommended Citation
Lee, Kangho; Lu, Gang; Facchetti, Antonio; Janes, David B.; and Marks, Tobin J., "Comparative passivation effects of self-assembled mono- and multilayers on GaAs junction field effect transistors" (2008). Birck and NCN Publications. Paper 170.
https://docs.lib.purdue.edu/nanopub/170