Chemistry and electronic properties of a metal-organic semiconductor interface: In on CuPc

Abstract

The chemistry and electronic structure of the interface between indium metal deposited onto thin films of CuPc ͑copper phthalocyanine͒ have been studied as a function of indium deposition using valence band ͑VB͒ and core level ͑CL͒ photoemission spectroscopy ͑PE͒. Two stages of the In/ CuPc interface formation upon In deposition have been observed. The first stage is characterized by a strong diffusion of the In atoms into the organic film. Metal ions occupy sites close to the pyrolle nitrogens of CuPc and strongly interact with molecules transferring negative charge. Indium diffusion into the organic films stops at a stoichiometry of In 2 CuPc. Subsequently, in the second stage the formation of a metallic indium film occurs on the top of the In 2 CuPc film.

Morphology and properties of a hybrid organic-inorganic system: Al nanoparticles embedded into CuPc thin film

“…The main N 1 s peak of the lowest spectrum in Fig. 4(d) was fitted by only one component thus confirming previous conclusions [20][21][22][23] that, in the case of CuPc, both nitrogen sites, N 1 and N 2 , are characterized by almost the same binding energy.…”

“…They evidence that the organic film spectra are characteristic of pristine CuPc. 20 The decomposition of the lowest spectrum in Fig. 4(b) approves former deductions [21][22][23] that the C 1 s core-level of pristine CuPc consists essentially of two components: B, which corresponds to the aromatic carbons of the benzene rings of CuPc, and P, shifted by 1.4 eV toward higher binding energy (BE), which is originated from the pyrrole carbon linked to the more electronegative nitrogen N 1 (four nitrogen atoms linked to the central metallic atom) and N 2 (four pyrrole nitrogen atoms).…”

“…Taking into account the fact that we have the same resolution as in Refs. 17 and 20 and taking the same fitting parameters, which were used for CuPc, 17,20 we analyzed the main N 1 s peak by two components: C (four nitrogen atoms N 1 linked to the central metallic atom) and P (four pyrrole nitrogen atoms N 2 ). By assuming that the central Cu atoms in the vicinity of the Al/CuPc interface are replaced by aluminum atoms, one can explain the observed N 1 s peak splitting.…”

In situ Raman growth monitoring of indium/copper phthalocyanine interfaces

“…Indium clusters are formed at the interface and the surface enhanced Raman spectroscopy (SERS) effect is observed. A comparison of the spectra with results of density functional theory (DFT) calculations do not support a formerly proposed structure of CuPc/indium mixed layers with covalent-like bonds [1].…”

“…The molecular structure of the CuPc / indium molecules (Fig. 2) is derived from a proposed CuPc / indium intermixed layer structure with covalent like bonds between indium and nitrogen atoms of CuPc [1]. The calculated frequencies for Raman features above 1000 cm -1 were additionally scaled by 0.9614 [10].…”