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Contact Architecture Controls Conductance in Monolayer Devices.

Kai B Saller¹, Kung-Ching Liao², Hubert Riedl³

¹Molecular Electronics, Technische Universität München, Theresienstrasse 90, 80333 Munich, Germany.

ACS Applied Materials & Interfaces

|June 11, 2020

Summary

Device architecture significantly impacts conductivity. Top-contact devices using self-assembled monolayers (SAMs) show much higher current than bottom-contact ones, highlighting the importance of contact geometry for molecular electronics.

Keywords:

bottom contacts nanogaps organic thin film electronics self-assembled monolayers top contacts

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Area of Science:

Molecular electronics
Materials science
Nanotechnology

Background:

Self-assembled monolayers (SAMs) can function as conductive channels.
Device architecture critically influences the performance of molecular electronic devices.

Purpose of the Study:

To investigate the effect of contact architecture on the electrical properties of organophosphonate SAMs.
To compare the conductivity of top-contact versus bottom-contact SAM devices.

Main Methods:

Fabrication of top-contact and bottom-contact devices using nanotransfer printing (nTP).
Assembly of organophosphonate SAMs from (9,10-di(naphthalen-2-yl)anthracen-2-yl)phosphonate.
Electrical characterization of devices under bias.

Main Results:

Top-contact devices exhibited current approximately 3 orders of magnitude higher than bottom-contact devices.
Conductance in top-contact devices was over 100,000 times greater than in devices without a SAM.
Significant differences in conductance were attributed to contact-to-SAM geometry and resistance.

Conclusions:

The electrical contact architecture profoundly affects the performance of SAM-based conductive channels.
Top-contact configurations offer superior conductivity for organophosphonate SAMs compared to bottom-contact.
Optimizing contact geometry is crucial for enhancing molecular electronic device efficiency.