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Issue 44, 2013
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Electronic excited states of a strongly correlated organic radical 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) adsorbed on a Si(001) surface

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Abstract

Electronic excited states of a strongly correlated organic radical, 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA), adsorbed on a Si(001) surface were investigated by means of two-photon photoemission spectroscopy (2PPE) to elucidate the functional organic thin-film formation on a typical semiconductor substrate. The spectra were interpreted with the aid of density functional theoretical calculations. The unpaired electron of TTTA forms a covalent bond with the dangling bond of the Si-dimer initially, and there are resonant states of TTTA to Si near the surface. The molecules adsorbed at room temperature form dimers having diamagnetic properties at thicknesses of a few monolayers, while the paramagnetic phase appears at multilayer thickness. From the change in the work function, the orientation of the adsorbed TTTA molecules was determined to change depending on the thickness of the adsorbed layer.

Graphical abstract: Electronic excited states of a strongly correlated organic radical 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) adsorbed on a Si(001) surface

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Publication details

The article was received on 12 Jul 2013, accepted on 19 Sep 2013 and first published on 23 Sep 2013


Article type: Paper
DOI: 10.1039/C3CP52919C
Citation: Phys. Chem. Chem. Phys., 2013,15, 19213-19220
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    Electronic excited states of a strongly correlated organic radical 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) adsorbed on a Si(001) surface

    K. Shudo, T. Satake, T. Shimatsu, M. Uchiyama and J. Takeda, Phys. Chem. Chem. Phys., 2013, 15, 19213
    DOI: 10.1039/C3CP52919C

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