Quantitative description of C-60 diffusion on an insulating surface
Autor(en): | Loske, Felix Luebbe, Jannis Schuette, Jens Reichling, Michael Kuehnle, Angelika |
Stichwörter: | ADSORPTION; GROWTH; Materials Science; Materials Science, Multidisciplinary; NANOSTRUCTURES; NUCLEATION; ORGANIC-MOLECULES; Physics; Physics, Applied; Physics, Condensed Matter; SIZE DISTRIBUTION; THIN-FILMS | Erscheinungsdatum: | 2010 | Herausgeber: | AMER PHYSICAL SOC | Journal: | PHYSICAL REVIEW B | Volumen: | 82 | Ausgabe: | 15 | Zusammenfassung: | The diffusion of C-60 molecules on large, atomically flat terraces of the CaF2(111) surface is studied under ultrahigh vacuum conditions at various substrate temperatures below room temperature. The weak molecule-substrate interaction on this insulating surface makes a direct observation of hopping events difficult. Therefore, to determine a quantitative value of the diffusion barrier, we employ the so-called onset method. This method is based on the analysis of spatial properties of islands created by nucleation of diffusing C-60 molecules, as measured by noncontact atomic force microscopy. We first determine the critical cluster size to be i* = 1 from coverage-dependent island size distributions prepared at a fixed substrate temperature. The diffusion barrier of E-d=(214 /- 16) meV and an attempt frequency of nu(0)=1.4 X 10(12 /- 0.6) s(-1) are then obtained by analyzing the island densities at different substrate temperatures. |
ISSN: | 24699950 | DOI: | 10.1103/PhysRevB.82.155428 |
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geprüft am 19.05.2024