Journalartikel

Jahr der Veröffentlichung: 1999

Seiten: 3078-3086

Zeitschrift: Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry)

Bandnummer: 103

Heftnummer: 16

ISSN: 1089-5647

DOI Link: https://doi.org/10.1021/jp983111h

Verlag: American Chemical Society

Abstract: 
Thin films (1-200 nm) of the title compounds were prepared by vapor deposition on glass at a controlled temperature; Film growth was studied in situ by optical absorption spectroscopy and measurement of the electrical conductivity. Independent of substrate temperature, a layered growth was found for ultrathin films of F16PcZn. During further deposition, this was followed by island formation (Stranski-Krastanov). Island growth from the beginning of deposition (Volmer-Weber) was found for MePTCDI. Both growth modes were confirmed by atomic force microscopy (AFM). Substrate temperature had a clear influence on the crystal structure of F16PcZn. A structure consisting of parallel stacks of molecules is formed first under all conditions. At lower temperature,this growth continues including, however, an increasing portion of amorphous material, whereas' a square lattice of molecules is formed at higher temperature. This was found to be the stable modification of F16PcZn since films deposited at lower temperature could be irreversibly transformed into this structure by annealing of the films. A reversible dependence of optical absorption spectra on temperature was found for the stable modification of both materials in the range from 78 to 450 K. Bands were found to narrow considerably at lower temperature, and shifts were observed that were characteristic for stronger intermolecular interaction which was very well- defined at lower temperature. A considerable mobility of molecules on the lattice site as well as between sites is indicated by the results of this study. The optical data are discussed in-terms of an established model of transition dipole coupling.

Harvard-Zitierstil: Schlettwein, D., Graaf, H., Meyer, J., Oekermann, T. and Jaeger, N. (1999) Molecular interactions in thin films of hexadecafluorophthalocyaninatozinc (F16PcZn) as compared to islands of N,N′-dimethylperylene-3,4,9,10-bicarboximide (MePTCDI), Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 103(16), pp. 3078-3086. https://doi.org/10.1021/jp983111h

APA-Zitierstil: Schlettwein, D., Graaf, H., Meyer, J., Oekermann, T., & Jaeger, N. (1999). Molecular interactions in thin films of hexadecafluorophthalocyaninatozinc (F16PcZn) as compared to islands of N,N′-dimethylperylene-3,4,9,10-bicarboximide (MePTCDI). Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry). 103(16), 3078-3086. https://doi.org/10.1021/jp983111h