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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