Issue 12, 2024

Reliable I/V characteristics and long lifetime of porphyrin-based single-molecule junctions

Abstract

In this work diamino-porphyrin derivatives, in their free base or cobalt complex forms, have been used to construct SMJs. Porphyrin oligomers were covalently bonded to a bottom electrode by diazonium cation electroreduction and a STM tip was used to complete the junction. Conductance versus time (G(t)) measurements reveal stable SMJs with lifetimes as long as 70 s, attributable to the diazonium bonding procedure and the amino anchoring groups. SMJ conductance was studied statistically by three methods: the STM-bj Ghisto(d) histograms, STM Gtime(t) and voltage-dependent Gvolt(V) heat maps. Conductance and attenuation factors (β) for Co or free-base porphyrin SMJs, compared by the three methods, are fully consistent, length-dependent and show a strong molecular signature. Trends in the variation of the attenuation factors versus voltage indicate a voltage-driven β decrease for both types of SMJ.

Graphical abstract: Reliable I/V characteristics and long lifetime of porphyrin-based single-molecule junctions

Supplementary files

Article information

Article type
Paper
Submitted
11 11 2023
Accepted
19 2 2024
First published
21 2 2024
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2024,12, 4326-4335

Reliable I/V characteristics and long lifetime of porphyrin-based single-molecule junctions

X. Yao, M. Vonesch, L. Guan, J. Wytko, J. Weiss, X. Sun and J. Lacroix, J. Mater. Chem. C, 2024, 12, 4326 DOI: 10.1039/D3TC04142E

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