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Issue 20, 2010
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Surface morphologies, electronic structures, and Kondo effect of lanthanide(iii)-phthalocyanine molecules on Au(111) by using STM, STS and FET properties for next generation devices

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Abstract

The crystal structures of double-decker single-molecule magnets (SMMs) LnPc2 (Ln = Tb(III) and Dy(III); Pc = phthalocyanine) and non-SMM YPc2 were determined by using single crystal X-ray diffraction analysis. The compounds are isomorphous to each other. The compounds have metal-centers (M3+ = Tb, Dy, and Y) sandwiched by two Pc ligands via eight isoindole-nitrogen atoms in a square-antiprism fashion. The twist angle between the two Pc ligands is 41.4°. Scanning tunneling microscopy (STM) was used to investigate the compounds adsorbed on a Au(111) surface, deposited by using thermal evaporation in ultra-high vacuum. Both MPc2 with eight-lobes and MPc with four-lobes, which has lost one Pc ligand, were observed. In the scanning tunneling spectroscopy (STS) images of TbPc molecules at 4.8 K, a Kondo peak with a Kondo temperature (TK) of ∼250 K was observed near the Fermi level (V = 0 V). On the other hand, DyPc, YPc and MPc2 exhibited no Kondo peak. In order to understand the observed Kondo effect, the energy splitting of sublevels in a crystal field should be taken into consideration. As the next step in our studies on the SMM/Kondo effect in Tb-Pc derivatives, we investigated the electronic transport properties of Ln-Pc molecules as the active layer in top- and bottom-contact thin-film organic field effect transistor (OFETs) devices. Tb-Pc molecule devices exhibit p-type semiconducting properties with a hole mobility (μH) of ∼10−4 cm2 V−1 s−1. Interestingly, the Dy-Pc based devices exhibited ambipolar semiconducting properties with an electron mobility (μe) of ∼10−5 and a hole mobility (μH) of ∼10−4 cm2 V−1 s−1. This behavior has important implications for the electronic structure of the molecules.

Graphical abstract: Surface morphologies, electronic structures, and Kondo effect of lanthanide(iii)-phthalocyanine molecules on Au(111) by using STM, STS and FET properties for next generation devices

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Supplementary files

Article information


Submitted
10 Dec 2009
Accepted
10 Mar 2010
First published
15 Apr 2010

Dalton Trans., 2010,39, 4708-4723
Article type
Perspective

Surface morphologies, electronic structures, and Kondo effect of lanthanide(III)-phthalocyanine molecules on Au(111) by using STM, STS and FET properties for next generation devices

K. Katoh, T. Komeda and M. Yamashita, Dalton Trans., 2010, 39, 4708
DOI: 10.1039/B926121D

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