Open AccessElectronic excited states of a strongly correlated organic radical 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) adsorbed on a Si(001) surface
Author(s) -
Kenichi Shudo,
T. Satake,
T. Shimatsu,
Masanobu Uchiyama,
Jun Takeda
Publication year - 2013
Publication title -
physical chemistry chemical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.053
H-Index - 239
eISSN - 1463-9084
pISSN - 1463-9076
DOI - 10.1039/c3cp52919c
Subject(s) - chemistry , dangling bond , excited state , adsorption , molecule , monolayer , diamagnetism , dimer , paramagnetism , electron paramagnetic resonance , substrate (aquarium) , silicon , nuclear magnetic resonance , atomic physics , condensed matter physics , organic chemistry , biochemistry , physics , oceanography , quantum mechanics , geology , magnetic field
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.
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