Anchor Groups for Graphene-Porphyrin Single-Molecule Transistors

Limburg, Bart and Thomas, James O. and Holloway, Gregory and Sadeghi, Hatef and Sangtarash, Sara and Hou, Ian Cheng-yi and Cremers, Jonathan and Narita, Akimitsu and Müllen, Klaus and Lambert, Colin J. and Briggs, G. Andrew D. and Mol, Jan A. and Anderson, Harry L. (2018) Anchor Groups for Graphene-Porphyrin Single-Molecule Transistors. Advanced Functional Materials, 28 (45). ISSN 1616-301X

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Abstract

The effectiveness of five different anchor groups for non‐covalent interfacing to graphene electrodes are compared. A family of six molecules is tested in single‐molecule junctions: five consist of the same porphyrin core with different anchor groups, and the sixth is a reference molecule without anchor groups. The junction formation probability (JFP) has a strong dependence on the anchor group. Larger anchors give higher binding energies to the graphene surface, correlating with higher JFPs. The best anchor groups tested are 1,3,8‐tridodecyloxypyrene and 2,5,8,11,14‐pentadodecylhexa‐peri‐hexabenzocoronene, with JFPs of 36% and 38%, respectively. Many junctions are tested at 77 K for each molecule by measuring source‐drain current as a function of bias and gate voltages. For each compound, there is wide variation in the strength of the electronic coupling to the electrodes and in the location of Coulomb peaks. In most cases, this device‐to‐device variability makes it impossible to observe trends between the anchor and the charge‐transport characteristics. Tetrabenzofluorene anchors, which are not π‐conjugated with the porphyrin, exhibit different charge transport behavior to the other anchors tested, and they show multiple Coulomb peaks with characteristically small molecular electron‐addition energies of 0.3–0.7 eV, whereas the other compounds give single Coulomb peaks.

Item Type:
Journal Article
Journal or Publication Title:
Advanced Functional Materials
Additional Information:
This is the peer reviewed version of the following article: B. Limburg, J. O. Thomas, G. Holloway, H. Sadeghi, S. Sangtarash, I. C.‐Y. Hou, J. Cremers, A. Narita, K. Müllen, C. J. Lambert, G. A. D. Briggs, J. A. Mol, H. L. Anderson, Adv. Funct. Mater. 2018, 28, 1803629. https://doi.org/10.1002/adfm.201803629 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/adfm.201803629/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Subjects:
ID Code:
127697
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Deposited On:
26 Sep 2018 15:36
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Sep 2020 04:48