Tunnel current in self-assembled monolayers of 3-mercaptopropyltrimethoxysilane

TL;DR

This study demonstrates that self-assembled monolayers of 3-mercaptopropyltrimethoxysilane exhibit excellent tunneling behavior as gate dielectrics, even with very short chains of only three carbon atoms, indicating potential for ultra-thin organic dielectric applications.

Contribution

It extends previous research by showing effective tunneling properties of molecular monolayers with only three carbon atoms, supporting their use as ultra-thin gate dielectrics.

Findings

MPTMS monolayers show asymmetric J-V characteristics dependent on voltage range.

Tunnel barrier heights are consistent with longer chains, confirming effective tunneling.

Monolayers exhibit good tunnel behavior up to 2.5 eV over a wide bias range.

Abstract

The current density-voltage (J-V) characteristics of self assembled monolayers of 3-mercaptopropyltrimethoxysilane (MPTMS) chemisorbed on the native oxide surface of p+-doped Si demonstrate the excellent tunnel dielectric behavior of organic monolayers down to 3 carbon atoms. The J-V characteristics of MPTMS SAMs on Si are found to be asymmetric, and the direction of rectification has been found to depend upon the applied voltage range. At voltages < 2.45V, the reverse bias current was found to be higher than forward bias current; while at higher voltages this trend was reversed. This result is in agreement with Simmons theory. The tunnel barrier heights for this short chain (2.56 and 2.14 eV respectively at Au and Si interfaces) are in good agreement with the ones for longer chains (>10 carbon atoms) if the chain is chemisorbed at the electrodes. These results extend all previous experiments on such molecular tunnel dielectrics down to 3 carbon atoms. This suggests that these molecular monolayers, having good tunnel behavior (up to 2.5 eV) over a large bias range, can be used as gate dielectric well below the limits of Si-based dielectrics.