Electronic structure and molecular orientation of a Zn-tetra-phenyl porphyrin multilayer on Si(111)

Abstract

The electronic properties and the molecular orientation of Zn-tetraphenyl-porphyrin films deposited on Si(111) have been investigated using synchrotron radiation. For the first time we have revealed and assigned the fine structures in the electronic spectra related to the HOMOs and LUMOs states. This is particularly important in order to understand the orbital interactions, the bond formation and the evolution of the electronic properties with oxidation or reduction of the porphyrins in supramolecular donor-acceptor complexes used in photovoltaic devices.

Surface transfer doping of diamond with a molecular heterojunction

“…8 The ZnTPP layer introduces a broad peak (labelled Z) positioned to the high BE side of the diamond peak and two small shake-up satellite peaks. The main ZnTPP peak has been fitted with a series of four C1s lines each of which corresponds to differently bonded carbon atoms within the tetraphenylporphyrin molecule; the relative intensity and position of the individual lines is consistent with the work of Cudia et al 9 The introduction of ZnTPP causes no apparent shift in the position of the diamond lines relative to E F and hence no band bending. This is consistent with the absence of surface conductivity when the porphyrin layer is introduced.…”

NEXAFS Study of Zinc Porphyrins Intercalated into V2O5 Xerogel

“…[8] At present NEXAFS C1s-and N1s-spectra of H 2 P and ZnTPP molecules are well known both experimentally and theoretically. [9][10][11] NEXAFS 1s-spectra obtained in present work well agree with these researches. The C1s-spectra fine structure elements of studied compounds consist of three groups: low peaks A 1 and A 2 (except molecules), high peaks B 1 and B 2 (except C 6 H 6 ) and wide bands C-E.…”

Molecular orientations, electronic properties and charge transfer timescale in a Zn-porphyrin/C70 donor–acceptor complex for solar cells

“…This indicates that when the electron is excited into the LUMO + 2(3) states it remains localized on the molecule for a time bigger but comparable (competing) to the core-hole lifetime and, therefore, this excited states contribute only partly to the core-hole decay as spectator state. On the contrary, in the LUMO and LUMO + 1 states the electron remains localized for a time bigger than the core-hole lifetime, which in the case of the C 1s of ZnTPP is about 5 fs [6].…”

“…Growth and characterization of ZnTPP multilayer films on clean Si(1 1 1) kept at room temperature have been discussed elsewhere [6]. Here we report on the charge transfer dynamics using resonant photoemission.…”